Leipoid, H. W., M. El-Hamidi, and D. Troyer. “Pathogen Studies of Bovine Progressive Degenerative Myeloencephalopathy (weaver) of Brown Swiss Cattle”. The Bovine Practitioner, no. 24, Nov. 1989, pp. 145-6, doi:10.21423/bovine-vol0no24p145-146.