Sivaseelan , Soundarapandian, et al. “Synergistic Pathological Effect of Mycoplasma Gallisepticum With Other Infectious Organisms in Layer Chickens”. Brazilian Journal of Veterinary Pathology, vol. 6, no. 2, July 2013, pp. 44-47, https://doi.org/10.24070/bjvp.1983-0246.006008.