Fratamico, P. M., Briggs, C. E., Needle, D., Chen, C., & DebRoy, C. (2003). Sequence of the Escherichia coli O121 O-Antigen Gene Cluster and Detection of Enterohemorrhagic E. coli O121 by PCR Amplification of the wzx and wzy Genes. American Society for Microbiology.

Fratamico, Pina M., Connie E. Briggs, Danielle Needle, Chin-Yi Chen, ja Chitrita DebRoy. Sequence of the Escherichia Coli O121 O-Antigen Gene Cluster and Detection of Enterohemorrhagic E. Coli O121 By PCR Amplification of the Wzx and Wzy Genes. American Society for Microbiology, 2003.

Fratamico, Pina M., et al. Sequence of the Escherichia Coli O121 O-Antigen Gene Cluster and Detection of Enterohemorrhagic E. Coli O121 By PCR Amplification of the Wzx and Wzy Genes. American Society for Microbiology, 2003.