Electrocardiographic parameters of captive lions (Panthera Leo) and tigers (Panthera tigris) immobilized with ketamine plus xylazine - Larsson, Maria Helena Matiko Akao; Coelho, Fernanda Montalvão; Oliveira, V. M. C; Yamaki, Fernanda Lie; Pereira, Guilherme Gonçalves; Soares, Elaine Cristina; Fedullo, José Daniel Luzes; Pereira, Roberto Carvalho; Ito, Fumio Honma (Journal of Zoo and Wildlife Medicine, 2008)