Lucci, C. de S., P. H. M. Rodrigues, E. J. Santos Jr., and A. L. de Castro. “Use of Bovine Somatotropin (BST) in High Producing Dairy Cows”. Brazilian Journal of Veterinary Research and Animal Science, vol. 35, no. 1, Jan. 1998, pp. 46-50, doi:10.1590/S1413-95961998000100009.