1. Centner, T.J., J.C. Alvey, and A.M. Stelzleni, Beta agonists in livestock feed: Status, health concerns, and international trade. Journal of animal science, 2014. 92(9): p. 4234-4240.
2. Rathmann, R., et al., Effects of zilpaterol hydrochloride and days on the finishing diet on feedlot performance, carcass characteristics, and tenderness in beef heifers. Journal of Animal Science, 2012. 90(9): p. 3301-3311.
4. Barker, D., Trade matters: Transatlantic trade and investment partnership (TTIP) - Impacts on food and farming, in Trade matters, J.H. Hanson, Cameron, Editor. 2014, Center for Food Safety: Pennsylvania.