Combination of ketamine and xylazine with opioids and acepromazine in rats: physiological changes and their analgesic effect analysed by ultrasonic vocalization - Laporte, Jilma Maria Aleman; Bandini, Luciana Ahlf; Gomes, Mariana S. A. Garcia; Zanatto, Dennis Albert; Fantoni, Denise Tabacchi; Pereira, Marco Aurélio Amador; Navas-Suárez, Pedro Enrique; Kirsten, Thiago Berti; Jimenez, Randall R; Alvarado, Gilbert; Mori, Claudia Madalena Cabrera (Laboratory Animals, 2020)