Siddique, N.; Naeem, K.; Ahmed, Z.; Malik, S. A. Evaluation of RT-PCR for the Detection of Influenza Virus Serotype H9N2 Among Broiler Chickens in Pakistan. Int. J. Poult. Sci. 2008, 7 (11), 1122–1127. https://doi.org/10.3923/ijps.2008.1122.1127.