Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2070022339', 'doi': 'https://doi.org/10.1016/j.knosys.2009.06.011', 'title': 'Rough set theory based on two universal sets and its applications', 'display_name': 'Rough set theory based on two universal sets and its applications', 'publication_year': 2009, 'publication_date': '2009-06-14', 'ids': {'openalex': 'https://openalex.org/W2070022339', 'doi': 'https://doi.org/10.1016/j.knosys.2009.06.011', 'mag': '2070022339'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1016/j.knosys.2009.06.011', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S10169007', 'display_name': 'Knowledge-Based Systems', 'issn_l': '0950-7051', 'issn': ['0950-7051', '1872-7409'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], '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/A5101872364', 'display_name': 'Guilong Liu', 'orcid': 'https://orcid.org/0000-0001-6861-0639'}, 'institutions': [{'id': 'https://openalex.org/I115212828', 'display_name': 'Beijing Language and Culture University', 'ror': 'https://ror.org/03te2zs36', 'country_code': 'CN', 'type': 'education', 'lineage': ['https://openalex.org/I115212828']}], 'countries': ['CN'], 'is_corresponding': True, 'raw_author_name': 'Guilong Liu', 'raw_affiliation_strings': ['School of Information Science, Beijing Language and Culture University, Beijing 100083, China'], 'affiliations': [{'raw_affiliation_string': 'School of Information Science, Beijing Language and Culture University, Beijing 100083, China', 'institution_ids': ['https://openalex.org/I115212828']}]}], 'institution_assertions': [], 'countries_distinct_count': 1, 'institutions_distinct_count': 1, 'corresponding_author_ids': ['https://openalex.org/A5101872364'], 'corresponding_institution_ids': ['https://openalex.org/I115212828'], 'apc_list': {'value': 3130, 'currency': 'USD', 'value_usd': 3130, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 9.609, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 136, 'citation_normalized_percentile': {'value': 0.97006, 'is_in_top_1_percent': False, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 98, 'max': 99}, 'biblio': {'volume': '23', 'issue': '2', 'first_page': '110', 'last_page': '115'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T11063', 'display_name': 'Rough Sets and Fuzzy Logic', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/1703', 'display_name': 'Computational Theory and Mathematics'}, 'field': {'id': 'https://openalex.org/fields/17', 'display_name': 'Computer Science'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, 'topics': [{'id': 'https://openalex.org/T11063', 'display_name': 'Rough Sets and Fuzzy Logic', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/1703', 'display_name': 'Computational Theory and Mathematics'}, 'field': {'id': 'https://openalex.org/fields/17', 'display_name': 'Computer Science'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/universal-set', 'display_name': 'Universal set', 'score': 0.7243631}, {'id': 'https://openalex.org/keywords/binary-relation', 'display_name': 'Binary relation', 'score': 0.68890864}], 'concepts': [{'id': 'https://openalex.org/C111012933', 'wikidata': 'https://www.wikidata.org/wiki/Q3137210', 'display_name': 'Rough set', 'level': 2, 'score': 0.8645083}, {'id': 'https://openalex.org/C102565666', 'wikidata': 'https://www.wikidata.org/wiki/Q1378301', 'display_name': 'Universal set', 'level': 3, 'score': 0.7243631}, {'id': 'https://openalex.org/C65180967', 'wikidata': 'https://www.wikidata.org/wiki/Q130901', 'display_name': 'Binary relation', 'level': 2, 'score': 0.68890864}, {'id': 'https://openalex.org/C33923547', 'wikidata': 'https://www.wikidata.org/wiki/Q395', 'display_name': 'Mathematics', 'level': 0, 'score': 0.6225642}, {'id': 'https://openalex.org/C39105242', 'wikidata': 'https://www.wikidata.org/wiki/Q5290286', 'display_name': 'Dominance-based rough set approach', 'level': 3, 'score': 0.6142887}, {'id': 'https://openalex.org/C42011625', 'wikidata': 'https://www.wikidata.org/wiki/Q1055058', 'display_name': 'Fuzzy set', 'level': 3, 'score': 0.5847635}, {'id': 'https://openalex.org/C177264268', 'wikidata': 'https://www.wikidata.org/wiki/Q1514741', 'display_name': 'Set (abstract data type)', 'level': 2, 'score': 0.55421716}, {'id': 'https://openalex.org/C48372109', 'wikidata': 'https://www.wikidata.org/wiki/Q3913', 'display_name': 'Binary number', 'level': 2, 'score': 0.5518516}, {'id': 'https://openalex.org/C13355873', 'wikidata': 'https://www.wikidata.org/wiki/Q2920850', 'display_name': 'Connection (principal bundle)', 'level': 2, 'score': 0.47918022}, {'id': 'https://openalex.org/C153046414', 'wikidata': 'https://www.wikidata.org/wiki/Q12482', 'display_name': 'Set theory', 'level': 3, 'score': 0.47756726}, {'id': 'https://openalex.org/C58166', 'wikidata': 'https://www.wikidata.org/wiki/Q224821', 'display_name': 'Fuzzy logic', 'level': 2, 'score': 0.42314678}, {'id': 'https://openalex.org/C25343380', 'wikidata': 'https://www.wikidata.org/wiki/Q277521', 'display_name': 'Relation (database)', 'level': 2, 'score': 0.42224452}, {'id': 'https://openalex.org/C118615104', 'wikidata': 'https://www.wikidata.org/wiki/Q121416', 'display_name': 'Discrete mathematics', 'level': 1, 'score': 0.41266423}, {'id': 'https://openalex.org/C80444323', 'wikidata': 'https://www.wikidata.org/wiki/Q2878974', 'display_name': 'Theoretical computer science', 'level': 1, 'score': 0.3578559}, {'id': 'https://openalex.org/C41008148', 'wikidata': 'https://www.wikidata.org/wiki/Q21198', 'display_name': 'Computer science', 'level': 0, 'score': 0.34875256}, {'id': 'https://openalex.org/C136119220', 'wikidata': 'https://www.wikidata.org/wiki/Q1000660', 'display_name': 'Algebra over a field', 'level': 2, 'score': 0.34560764}, {'id': 'https://openalex.org/C11413529', 'wikidata': 'https://www.wikidata.org/wiki/Q8366', 'display_name': 'Algorithm', 'level': 1, 'score': 0.33240226}, {'id': 'https://openalex.org/C202444582', 'wikidata': 'https://www.wikidata.org/wiki/Q837863', 'display_name': 'Pure mathematics', 'level': 1, 'score': 0.25712335}, {'id': 'https://openalex.org/C124101348', 'wikidata': 'https://www.wikidata.org/wiki/Q172491', 'display_name': 'Data mining', 'level': 1, 'score': 0.25638825}, {'id': 'https://openalex.org/C154945302', 'wikidata': 'https://www.wikidata.org/wiki/Q11660', 'display_name': 'Artificial intelligence', 'level': 1, 'score': 0.20230985}, {'id': 'https://openalex.org/C94375191', 'wikidata': 'https://www.wikidata.org/wiki/Q11205', 'display_name': 'Arithmetic', 'level': 1, 'score': 0.09308407}, {'id': 'https://openalex.org/C2524010', 'wikidata': 'https://www.wikidata.org/wiki/Q8087', 'display_name': 'Geometry', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C199360897', 'wikidata': 'https://www.wikidata.org/wiki/Q9143', 'display_name': 'Programming language', 'level': 1, 'score': 0.0}], 'mesh': [], 'locations_count': 1, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1016/j.knosys.2009.06.011', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S10169007', 'display_name': 'Knowledge-Based Systems', 'issn_l': '0950-7051', 'issn': ['0950-7051', '1872-7409'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': None, 'sustainable_development_goals': [{'display_name': 'Peace, justice, and strong institutions', 'id': 'https://metadata.un.org/sdg/16', 'score': 0.84}], 'grants': [{'funder': 'https://openalex.org/F4320321001', 'funder_display_name': 'National Natural Science Foundation of China', 'award_id': '60973148'}, {'funder': 'https://openalex.org/F4320321106', 'funder_display_name': "Ministry of Education of the People's Republic of China", 'award_id': '108133'}], 'datasets': [], 'versions': [], 'referenced_works_count': 37, 'referenced_works': ['https://openalex.org/W1505150927', 'https://openalex.org/W1514968118', 'https://openalex.org/W1523763698', 'https://openalex.org/W1550443332', 'https://openalex.org/W1557923305', 'https://openalex.org/W1584679449', 'https://openalex.org/W1587782513', 'https://openalex.org/W1592094058', 'https://openalex.org/W1606985731', 'https://openalex.org/W1848846592', 'https://openalex.org/W1889630404', 'https://openalex.org/W190934746', 'https://openalex.org/W1971266491', 'https://openalex.org/W1978202330', 'https://openalex.org/W1983426508', 'https://openalex.org/W1987251161', 'https://openalex.org/W1988907639', 'https://openalex.org/W2007247975', 'https://openalex.org/W2018669023', 'https://openalex.org/W2027654459', 'https://openalex.org/W2028561988', 'https://openalex.org/W2033735274', 'https://openalex.org/W2051316961', 'https://openalex.org/W2053749030', 'https://openalex.org/W2078975878', 'https://openalex.org/W2084973197', 'https://openalex.org/W2099167966', 'https://openalex.org/W2134866037', 'https://openalex.org/W2143040521', 'https://openalex.org/W2143451122', 'https://openalex.org/W2156276401', 'https://openalex.org/W2163040111', 'https://openalex.org/W2570343052', 'https://openalex.org/W2617942944', 'https://openalex.org/W2797148637', 'https://openalex.org/W4255833381', 'https://openalex.org/W53283552'], 'related_works': ['https://openalex.org/W2978519593', 'https://openalex.org/W2470161084', 'https://openalex.org/W2382975841', 'https://openalex.org/W2375433344', 'https://openalex.org/W2207260620', 'https://openalex.org/W2167108569', 'https://openalex.org/W2123662875', 'https://openalex.org/W2100155797', 'https://openalex.org/W2064989302', 'https://openalex.org/W1695035718'], 'abstract_inverted_index': None, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2070022339', 'counts_by_year': [{'year': 2024, 'cited_by_count': 2}, {'year': 2023, 'cited_by_count': 7}, {'year': 2022, 'cited_by_count': 10}, {'year': 2021, 'cited_by_count': 11}, {'year': 2020, 'cited_by_count': 7}, {'year': 2019, 'cited_by_count': 9}, {'year': 2018, 'cited_by_count': 7}, {'year': 2017, 'cited_by_count': 3}, {'year': 2016, 'cited_by_count': 9}, {'year': 2015, 'cited_by_count': 12}, {'year': 2014, 'cited_by_count': 12}, {'year': 2013, 'cited_by_count': 15}, {'year': 2012, 'cited_by_count': 24}], 'updated_date': '2024-12-31T08:42:32.549090', 'created_date': '2016-06-24'}