Comparison of cardiopulmonary effects of medetomidine-midazolam, acepromazine-butorphanol and midazolam-butorphanol in dogs - Kojima, K; Nishimura, R; Mutoh, T; Takao, K; Matsunaga, S; Mochizuki, M; Sasaki, N (Zentralbl Veterinarmed A, 1999)