Njue AI, Prichard RK. Efficacy of ivermectin in calves against a resistant Cooperia oncophora field isolate. Parasitol Res. 2004 Aug 1;93(5):419-22.
French M, Neighbors D, Carswell L, Williams R, Bush L. A model for estimating industry compliance costs of food labeling regulations. Agribusiness: An International Journal. 1993;8(2):165-86.