SWARNA, C, et al. “Effect of Added Lipases of Psychrotrophic Yersinia, Enterobacter and Citrobacter Spp. On the Keeping Quality of Milk and Fat Rich Milk Products”. The Indian Journal of Animal Sciences, vol. 67, no. 7, Nov. 2013, https://epubs.icar.org.in/index.php/IJAnS/article/view/34852.