B. MISHRA, G. R. KUMAR, S. SONAL, C. L. PATEL, and V. K. CHATURVEDI, “Phylogenetic analysis of sheep pox virus (SPPV) virion core protein P4a gene revealed extensive sequence conservation among capripox viruses”, Indian J of Anim Sci, vol. 88, no. 1, pp. 21–24, May 2018.