TY  - RPRT
TI  - Selection forces and constraints on retroviral sequence variation.
AU  - J Overbaugh
AU  - C R Bangham
PY  - 2001
DO  - 10.1126/science.1059128
UR  - https://pubmed.ncbi.nlm.nih.gov/11352065/
ID  - 11352065
ER  -