DE, BALRAM, SATISH KUMAR, GREESH MOHAN, and K L SAHNI. 2013. “Effect of Zwitter Ion Buffers on Freeze Preservation of Holstein-Friesian Spermatozoa under Tropical Climate”. The Indian Journal of Animal Sciences 67 (4). https://epubs.icar.org.in/index.php/IJAnS/article/view/34343.