Cornelissen, M., van den Burg, R., Zorgdrager, F., Lukashov, V., & Goudsmit, J. (1997). pol gene diversity of five human immunodeficiency virus type 1 subtypes: Evidence for naturally occurring mutations that contribute to drug resistance, limited recombination patterns, and common ancestry for subtypes B and D. J Virol.

Cornelissen, M., R. van den Burg, F. Zorgdrager, V. Lukashov, and J. Goudsmit. "Pol Gene Diversity of Five Human Immunodeficiency Virus Type 1 Subtypes: Evidence for Naturally Occurring Mutations That Contribute to Drug Resistance, Limited Recombination Patterns, and Common Ancestry for Subtypes B and D." J Virol 1997.

Cornelissen, M., et al. "Pol Gene Diversity of Five Human Immunodeficiency Virus Type 1 Subtypes: Evidence for Naturally Occurring Mutations That Contribute to Drug Resistance, Limited Recombination Patterns, and Common Ancestry for Subtypes B and D." J Virol 1997.