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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. 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. 1997.