Sivilaikul, Somsajee, Amornrat Jitprom, Ajaree Kularb, Kornchai Kornkaewrut, Piyawan Suthanmaphinuth, Sittidet Mahasawangkul, Kulnasan Saikhun, Worawidh Wajjwalku, and Sitthawee Thongtipsiridech. 2010. “Relationship Between Seminal and Serum Calcium Concentration With Semen Quality in the Asian Elephant (Elephas Maximus)”. The Thai Journal of Veterinary Medicine 40 (3):251-55. https://he01.tci-thaijo.org/index.php/tjvm/article/view/35706.