Elmore, R. G., D. J. Hardin, D. R. Bolinger, and C. J. Bierschwal. “Palpation Facilities for Conducting Dairy Reproductive Herd Health Programs”. The Bovine Practitioner, no. 21, Nov. 1986, pp. 150-1, doi:10.21423/bovine-vol0no21p150-151.