Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2160748163', 'doi': 'https://doi.org/10.1007/s00020-009-1692-z', 'title': 'On Positive Linear Volterra-Stieltjes Differential Systems', 'display_name': 'On Positive Linear Volterra-Stieltjes Differential Systems', 'publication_year': 2009, 'publication_date': '2009-06-26', 'ids': {'openalex': 'https://openalex.org/W2160748163', 'doi': 'https://doi.org/10.1007/s00020-009-1692-z', 'mag': '2160748163'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1007/s00020-009-1692-z', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S76385772', 'display_name': 'Integral Equations and Operator Theory', 'issn_l': '0378-620X', 'issn': ['0378-620X', '1420-8989'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320186', 'host_organization_name': 'Birkhäuser', 'host_organization_lineage': ['https://openalex.org/P4310320186', 'https://openalex.org/P4310319900', 'https://openalex.org/P4310319965'], 'host_organization_lineage_names': ['Birkhäuser', 'Springer Science+Business Media', 'Springer Nature'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref'], 'open_access': {'is_oa': False, 'oa_status': 'closed', 'oa_url': None, 'any_repository_has_fulltext': False}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5050956546', 'display_name': 'Pham Huu Anh Ngoc', 'orcid': 'https://orcid.org/0000-0002-7958-9254'}, 'institutions': [{'id': 'https://openalex.org/I119449181', 'display_name': 'Technische Universität Ilmenau', 'ror': 'https://ror.org/01weqhp73', 'country_code': 'DE', 'type': 'education', 'lineage': ['https://openalex.org/I119449181']}], 'countries': ['DE'], 'is_corresponding': True, 'raw_author_name': 'P. H. Anh Ngoc', 'raw_affiliation_strings': ['Institute of Mathematics, Technical University Ilmenau, Weimarer Straße 25, 98693, Ilmenau, Germany'], 'affiliations': [{'raw_affiliation_string': 'Institute of Mathematics, Technical University Ilmenau, Weimarer Straße 25, 98693, Ilmenau, Germany', 'institution_ids': ['https://openalex.org/I119449181']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5018341927', 'display_name': 'Satoru Murakami', 'orcid': 'https://orcid.org/0000-0001-9601-2601'}, 'institutions': [{'id': 'https://openalex.org/I136446963', 'display_name': 'Okayama University of Science', 'ror': 'https://ror.org/05aevyc10', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I136446963']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'S. Murakami', 'raw_affiliation_strings': ['Department of Applied Mathematics, Okayama University of Science, Ridaicho, Okayama, 700-0005, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Applied Mathematics, Okayama University of Science, Ridaicho, Okayama, 700-0005, Japan', 'institution_ids': ['https://openalex.org/I136446963']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5087524650', 'display_name': 'Toshiki Naito', 'orcid': 'https://orcid.org/0000-0003-2948-5454'}, 'institutions': [{'id': 'https://openalex.org/I20529979', 'display_name': 'University of Electro-Communications', 'ror': 'https://ror.org/02x73b849', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I20529979']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'T. Naito', 'raw_affiliation_strings': ['Department of Mathematics, University of Electro-Communication, Chofu, Tokyo, 182-8585, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Mathematics, University of Electro-Communication, Chofu, Tokyo, 182-8585, Japan', 'institution_ids': ['https://openalex.org/I20529979']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5101659246', 'display_name': 'Jong Son Shin', 'orcid': 'https://orcid.org/0000-0002-2602-6837'}, 'institutions': [{'id': 'https://openalex.org/I20529979', 'display_name': 'University of Electro-Communications', 'ror': 'https://ror.org/02x73b849', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I20529979']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'J. Son Shin', 'raw_affiliation_strings': ['Department of Mathematics, University of Electro-Communication, Chofu, Tokyo, 182-8585, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Mathematics, University of Electro-Communication, Chofu, Tokyo, 182-8585, Japan', 'institution_ids': ['https://openalex.org/I20529979']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5083074826', 'display_name': 'Yutaka Nagabuchi', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I136446963', 'display_name': 'Okayama University of Science', 'ror': 'https://ror.org/05aevyc10', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I136446963']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'Y. Nagabuchi', 'raw_affiliation_strings': ['Department of Applied Mathematics, Okayama University of Science, Ridaicho, Okayama, 700-0005, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Applied Mathematics, Okayama University of Science, Ridaicho, Okayama, 700-0005, Japan', 'institution_ids': ['https://openalex.org/I136446963']}]}], 'countries_distinct_count': 2, 'institutions_distinct_count': 3, 'corresponding_author_ids': ['https://openalex.org/A5050956546'], 'corresponding_institution_ids': ['https://openalex.org/I119449181'], 'apc_list': {'value': 2290, 'currency': 'EUR', 'value_usd': 2890, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 6.235, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 18, 'citation_normalized_percentile': {'value': 0.93272, 'is_in_top_1_percent': False, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 88, 'max': 89}, 'biblio': {'volume': '64', 'issue': '3', 'first_page': '325', 'last_page': '355'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T11110', 'display_name': 'Analysis and Control of Distributed Parameter Systems', 'score': 0.9977, 'subfield': {'id': 'https://openalex.org/subfields/2207', 'display_name': 'Control and Systems Engineering'}, 'field': {'id': 'https://openalex.org/fields/22', 'display_name': 'Engineering'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, 'topics': [{'id': 'https://openalex.org/T11110', 'display_name': 'Analysis and Control of Distributed Parameter Systems', 'score': 0.9977, 'subfield': {'id': 'https://openalex.org/subfields/2207', 'display_name': 'Control and Systems Engineering'}, 'field': {'id': 'https://openalex.org/fields/22', 'display_name': 'Engineering'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T10541', 'display_name': 'Theory and Applications of Fractional Differential Equations', 'score': 0.9977, 'subfield': {'id': 'https://openalex.org/subfields/2604', 'display_name': 'Applied Mathematics'}, 'field': {'id': 'https://openalex.org/fields/26', 'display_name': 'Mathematics'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T11416', 'display_name': 'Numerical Integration Methods for Differential Equations', 'score': 0.9954, 'subfield': {'id': 'https://openalex.org/subfields/2612', 'display_name': 'Numerical Analysis'}, 'field': {'id': 'https://openalex.org/fields/26', 'display_name': 'Mathematics'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/riemann–stieltjes-integral', 'display_name': 'Riemann–Stieltjes integral', 'score': 0.7050781}, {'id': 'https://openalex.org/keywords/nonlinear-systems', 'display_name': 'Nonlinear Systems', 'score': 0.522528}, {'id': 'https://openalex.org/keywords/positive-systems', 'display_name': 'Positive systems', 'score': 0.52160895}], 'concepts': [{'id': 'https://openalex.org/C33923547', 'wikidata': 'https://www.wikidata.org/wiki/Q395', 'display_name': 'Mathematics', 'level': 0, 'score': 0.87698454}, {'id': 'https://openalex.org/C167211080', 'wikidata': 'https://www.wikidata.org/wiki/Q285771', 'display_name': 'Riemann–Stieltjes integral', 'level': 3, 'score': 0.7050781}, {'id': 'https://openalex.org/C93226319', 'wikidata': 'https://www.wikidata.org/wiki/Q193137', 'display_name': 'Differential (mechanical device)', 'level': 2, 'score': 0.5782135}, {'id': 'https://openalex.org/C6802819', 'wikidata': 'https://www.wikidata.org/wiki/Q1072174', 'display_name': 'Linear system', 'level': 2, 'score': 0.5584676}, {'id': 'https://openalex.org/C2778299942', 'wikidata': 'https://www.wikidata.org/wiki/Q7233296', 'display_name': 'Positive systems', 'level': 3, 'score': 0.52160895}, {'id': 'https://openalex.org/C112972136', 'wikidata': 'https://www.wikidata.org/wiki/Q7595718', 'display_name': 'Stability (learning theory)', 'level': 2, 'score': 0.5142769}, {'id': 'https://openalex.org/C78045399', 'wikidata': 'https://www.wikidata.org/wiki/Q11214', 'display_name': 'Differential equation', 'level': 2, 'score': 0.43559766}, {'id': 'https://openalex.org/C134306372', 'wikidata': 'https://www.wikidata.org/wiki/Q7754', 'display_name': 'Mathematical analysis', 'level': 1, 'score': 0.42145}, {'id': 'https://openalex.org/C28826006', 'wikidata': 'https://www.wikidata.org/wiki/Q33521', 'display_name': 'Applied mathematics', 'level': 1, 'score': 0.3802111}, {'id': 'https://openalex.org/C27016315', 'wikidata': 'https://www.wikidata.org/wiki/Q580101', 'display_name': 'Integral equation', 'level': 2, 'score': 0.13834429}, {'id': 'https://openalex.org/C41008148', 'wikidata': 'https://www.wikidata.org/wiki/Q21198', 'display_name': 'Computer science', 'level': 0, 'score': 0.05575648}, {'id': 'https://openalex.org/C146978453', 'wikidata': 'https://www.wikidata.org/wiki/Q3798668', 'display_name': 'Aerospace engineering', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C127413603', 'wikidata': 'https://www.wikidata.org/wiki/Q11023', 'display_name': 'Engineering', 'level': 0, 'score': 0.0}, {'id': 'https://openalex.org/C119857082', 'wikidata': 'https://www.wikidata.org/wiki/Q2539', 'display_name': 'Machine learning', 'level': 1, 'score': 0.0}], 'mesh': [], 'locations_count': 1, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1007/s00020-009-1692-z', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S76385772', 'display_name': 'Integral Equations and Operator Theory', 'issn_l': '0378-620X', 'issn': ['0378-620X', '1420-8989'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320186', 'host_organization_name': 'Birkhäuser', 'host_organization_lineage': ['https://openalex.org/P4310320186', 'https://openalex.org/P4310319900', 'https://openalex.org/P4310319965'], 'host_organization_lineage_names': ['Birkhäuser', 'Springer Science+Business Media', 'Springer Nature'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': None, 'sustainable_development_goals': [], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 28, 'referenced_works': ['https://openalex.org/W1521302685', 'https://openalex.org/W1527296550', 'https://openalex.org/W1534430411', 'https://openalex.org/W1579645751', 'https://openalex.org/W1594563152', 'https://openalex.org/W1608548244', 'https://openalex.org/W1937028141', 'https://openalex.org/W1972729931', 'https://openalex.org/W1983868185', 'https://openalex.org/W2010004902', 'https://openalex.org/W2020322142', 'https://openalex.org/W2032991116', 'https://openalex.org/W2042024445', 'https://openalex.org/W2050649877', 'https://openalex.org/W2054446036', 'https://openalex.org/W2062448723', 'https://openalex.org/W2071376769', 'https://openalex.org/W2073540225', 'https://openalex.org/W2075613915', 'https://openalex.org/W2081921309', 'https://openalex.org/W2084211207', 'https://openalex.org/W2089268004', 'https://openalex.org/W210876736', 'https://openalex.org/W2127962794', 'https://openalex.org/W2130813144', 'https://openalex.org/W2144781470', 'https://openalex.org/W22103694', 'https://openalex.org/W2610857016'], 'related_works': ['https://openalex.org/W3203676140', 'https://openalex.org/W2904267548', 'https://openalex.org/W2185573112', 'https://openalex.org/W2169744002', 'https://openalex.org/W2142388326', 'https://openalex.org/W1996493114', 'https://openalex.org/W1965191890', 'https://openalex.org/W172361930', 'https://openalex.org/W1527511486', 'https://openalex.org/W1484417697'], 'abstract_inverted_index': None, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2160748163', 'counts_by_year': [{'year': 2017, 'cited_by_count': 1}, {'year': 2015, 'cited_by_count': 1}, {'year': 2014, 'cited_by_count': 4}, {'year': 2013, 'cited_by_count': 5}, {'year': 2012, 'cited_by_count': 1}], 'updated_date': '2024-08-19T23:52:51.782327', 'created_date': '2016-06-24'}