Berry, S. L., T. W. Graham, A. Mongini, and M. Arana. “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, vol. 33, no. 1, Jan. 1999, pp. 6-11, doi:10.21423/bovine-vol33no1p6-11.