Malavasi, L. M., M. Jensen-Warern, H. Augustsson, J. E. Lindberg, e G. Nyman. “Effects of Preoperative Epidural Morphine and Ingramuscular Buprenorphones in Pigs Subjected to Abdominal Surgery: A Pilot Study”. Scientia Agraria Paranaensis, vol. 5, nº 2, janeiro de 2000, p. p. 21-30, doi:10.18188/sap.v5i2.2023.