BECHERT, U.; FRAKER, M. Immune response of African elephants to a single dose of SpayVac®, a pZP contraceptive vaccine, over a seven year period. Pachyderm, [S. l.], v. 57, p. 97–108, 2016. Disponível em: https://pachydermjournal.org/index.php/pachyderm/article/view/395. Acesso em: 1 may. 2024.