GRIFFITHS, David; BORN, Erik W; ACQUARONE, Mario. Prolonged chemical restraint of walrus (Odobenus rosmarus) with etorphine supplemented with medetomidine. NAMMCO Scientific Publications, Tromsø, Norway, v. 9, p. 361–369, 2014. DOI: 10.7557/3.3015. Disponível em: https://septentrio.uit.no/index.php/NAMMCOSP/article/view/3015. Acesso em: 8 jun. 2026.