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 [Internet]. 2016 Jul. 21 [cited 2024 May 2];57:97-108. Available from: https://pachydermjournal.org/index.php/pachyderm/article/view/395