CS1 maint: Multiple names: authors list (link) Cite journal Last name Barua, D., & Cvjetanovic B. Year of publication 1972 Title The seventh pandemic of cholera Journal Nature Volume 239 Issue 5368 Pages 137–8 DOI 10.1038/239137a0 PMID 4561957 ↑ Sharma, C.; et al. (1998). "Molecular Evidence that a Distinct Vibrio cholerae O1 Biotype El Tor Strain in Calcutta May Have Spread to the African Continent".