Gama, B. E., and J. N. dos S. S. Couceiro. “Glycosylation Influencing on Fusion Activity of HA and HEF Structures of Influenza Viruses”. Journal of Medical and Biological Sciences, vol. 2, no. 2, Jan. 2003, pp. 170-5, doi:10.9771/cmbio.v2i2.4283.