MAHMUDA, A. .; YAKUBU, Y. .; ABDULLLAHI RAJI, A. .; LAWAL, N. .; SAIDU, B. .; DANMAIGORO, A. .; BELLO, A. . Prevalence of gastrointestinal round worms in calves in Sokoto, northwestern, Nigeria. Scientific Journal of Zoology, v. 1, n. 2, p. 26-30, 30 Sep. 2012.