Britt, J. S., Berry, S. L., Shearer, J., Hemling, T., Steevens, B. and Dreher, M. (1999) “A Uniform protocol for evaluating response to treatment of papillomatous digital dermatitis lesions”, The Bovine Practitioner, 33(2), pp. 149–154. doi: 10.21423/bovine-vol33no2p149-154.