Z. A. Khowaja, M. I. Soomro, A. K. Pirzada, M. A. Yoosuf, and V. Kumar, “Awareness of the Pandemic H1N1 Influenza global outbreak 2009 among medical students in Karachi, Pakistan”, J Infect Dev Ctries, vol. 5, no. 03, pp. 151–155, Mar. 2011.