Berry, S. L., Graham, T. W., Mongini, A. and Arana, M. (1999) “The Efficacy of Serpens spp bacterin combined with topical administration of lincomycin hydrochloride for treatment of papillomatous digital dermatitis (footwarts) in cows on a dairy in California”, The Bovine Practitioner, 33(1), pp. 6–11. doi: 10.21423/bovine-vol33no1p6-11.