Letvin, N. L., Li, J., Halloran, M., Cranage, M. P., Rud, E. W., & Sodroski, J. (1995). Prior infection with a nonpathogenic chimeric simian-human immunodeficiency virus does not efficiently protect macaques against challenge with simian immunodeficiency virus.

Letvin, N L., J. Li, M. Halloran, M P. Cranage, E W. Rud, and J. Sodroski. Prior Infection With a Nonpathogenic Chimeric Simian-human Immunodeficiency Virus Does Not Efficiently Protect Macaques against Challenge With Simian Immunodeficiency Virus. 1995.

Letvin, N L., et al. Prior Infection With a Nonpathogenic Chimeric Simian-human Immunodeficiency Virus Does Not Efficiently Protect Macaques against Challenge With Simian Immunodeficiency Virus. 1995.