Weinstein, Scott A.; Schmidt, James J.; Smith, Leonard A. (30 March 1991). "Lethal toxins and cross-neutralization of venoms from the African water cobras, Boulengerina annulata annulata and Boulengerina christyi ". Toxicon. 29 (11): 1315–1327. doi:10.1016/0041-0101(91)90118-B. PMID1814007.
Weinstein, Scott A.; Schmidt, James J.; Smith, Leonard A. (30 March 1991). "Lethal toxins and cross-neutralization of venoms from the African water cobras, Boulengerina annulata annulata and Boulengerina christyi ". Toxicon. 29 (11): 1315–1327. doi:10.1016/0041-0101(91)90118-B. PMID1814007.