SELVAM, A, et al. “Detection of Mycobacterium Avium Subsp Paratuberculosis in Milk of Asymptomatic Sheep by Polymerase Chain Reaction”. The Indian Journal of Animal Sciences, vol. 79, no. 8, Jan. 2011, https://epubs.icar.org.in/index.php/IJAnS/article/view/3088.