Dahlen, C. R., and C. L. Stoltenow. “The PregCard Study: Assessing the Impact of Routine Management Strategies on Reproductive Performance of Beef Herds in the Upper Great Plains”. The Bovine Practitioner, vol. 49, no. 2, June 2015, pp. 152-5, doi:10.21423/bovine-vol49no2p152-155.