Palmisano, John, and Michael Deininger. “Adaptation to the Waste Anesthesia Gas System: Gaps in Knowledge and Opportunities for Positive Environmental Impact”. Journal of Advanced Veterinary and Animal Research, vol. 2, no. 4, Dec. 2015, pp. 388-95, https://www.banglajol.info/index.php/JAVAR/article/view/26086.