Caldwell, V., L. DesCoteaux, E. Bouchard, D. DuTremblay, I. R. Dohoo, and F. Markham. “Gastrointestinal Nematodes in Quebec Dairy Cattle: Herd Prevalence, Level of Infection Estimated by Bulk Tank Milk ELISA Testing and Related Risk Factors”. The Bovine Practitioner, vol. 36, no. 2, June 2002, pp. 117-25, doi:10.21423/bovine-vol36no2p117-125.