Kwon, EO; Armenakas, NA; Scharf, SC; Panagopoulos, G; Fracchia, JA. The poppy seed test for colovesical fistula: big bang, little bucks!. The Journal of Urology. Apr 2008, 179 (4): 1425–7. PMID 18289575. doi:10.1016/j.juro.2007.11.085.
Kwon, EO; Armenakas, NA; Scharf, SC; Panagopoulos, G; Fracchia, JA. The poppy seed test for colovesical fistula: big bang, little bucks!. The Journal of Urology. Apr 2008, 179 (4): 1425–7. PMID 18289575. doi:10.1016/j.juro.2007.11.085.