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Database resources of the National Center for Biotechnology Information. Nucleic Acids Research, 2013-1, roč. 41, čís. Database issue, s. D8–D20. PMID: 23193264
PMCID: PMC3531099. Dostupné online [cit. 2021-05-03]. ISSN0305-1048. DOI: 10.1093/nar/gks1189.
WHEELER, David L.; BARRETT, Tanya; BENSON, Dennis A.. Database resources of the National Center for Biotechnology Information. Nucleic Acids Research, 2007-1, roč. 35, čís. Database issue, s. D5–D12. PMID: 17170002
PMCID: PMC1781113. Dostupné online [cit. 2021-05-03]. ISSN0305-1048. DOI: 10.1093/nar/gkl1031.