Güneş V, Ünver A, Çitil M, Erdoğan HM. The Prevalence of Eschericia coli O157 Serotype and Clostridium perfringens Type A a-Toxin in Neonatal Diarrhoeic Calves in Kars District. Kafkas Univ Vet Fak Derg, 10 (1): 41-45, 2004.