1. The relationship between postpartum estrous cycles, estrous cycle length, and early embryonic death;Britt;Cattle Practice,1995
2. de Vries, A. 2001. Statistical process control charts applied to dairy herd reproduction. Ph.D. Diss., Univ. of Minnesota, St. Paul. UMI Digital Dissertations AAT 3002792.
3. Calculating selected reproductive indices: recommendations of the American Association of Bovine Practitioners;Fetrow;J. Dairy Sci.,1990
4. Cumulative Sum Charts and Charting for Quality Improvement;Hawkins,1998
5. Weibull maximum likelihood parameter estimates with censored data;Keats;J. Quality Technol.,1997