Wu, C. H.; Yeh, L. S.; Huang, H.; Arminski, L.; Castro-Alvear, J.; Chen, Y.; Hu, Z.; Kourtesis, P.; Ledley, R. S.; Suzek, B. E.; Vinayaka, C. R.; Zhang, J.; Barker, W. C. (2003). "The Protein Information Resource". Nucleic Acids Research. 31 (1): 345–347. doi:10.1093/nar/gkg040. PMC165487. PMID12520019.
Li, W.; Jaroszewski, L.; Godzik, A. (2001). "Clustering of highly homologous sequences to reduce the size of large protein databases". Bioinformatics. 17 (3): 282–283. doi:10.1093/bioinformatics/17.3.282. PMID11294794.
Wu, C. H.; Yeh, L. S.; Huang, H.; Arminski, L.; Castro-Alvear, J.; Chen, Y.; Hu, Z.; Kourtesis, P.; Ledley, R. S.; Suzek, B. E.; Vinayaka, C. R.; Zhang, J.; Barker, W. C. (2003). "The Protein Information Resource". Nucleic Acids Research. 31 (1): 345–347. doi:10.1093/nar/gkg040. PMC165487. PMID12520019.
Li, W.; Jaroszewski, L.; Godzik, A. (2001). "Clustering of highly homologous sequences to reduce the size of large protein databases". Bioinformatics. 17 (3): 282–283. doi:10.1093/bioinformatics/17.3.282. PMID11294794.
Wu, C. H.; Yeh, L. S.; Huang, H.; Arminski, L.; Castro-Alvear, J.; Chen, Y.; Hu, Z.; Kourtesis, P.; Ledley, R. S.; Suzek, B. E.; Vinayaka, C. R.; Zhang, J.; Barker, W. C. (2003). "The Protein Information Resource". Nucleic Acids Research. 31 (1): 345–347. doi:10.1093/nar/gkg040. PMC165487. PMID12520019.