Haffar, O. K., Smithgall, M. D., Bradshaw, J., Brady, B., Damle, N. K., & Linsley, P. S. (1993). Costimulation of T-cell activation and virus production by B7 antigen on activated CD4+ T cells from human immunodeficiency virus type 1-infected donors. Proc Natl Acad Sci U S A.

Haffar, O K., M D. Smithgall, J. Bradshaw, B. Brady, N K. Damle, and P S. Linsley. "Costimulation of T-cell Activation and Virus Production By B7 Antigen On Activated CD4+ T Cells From Human Immunodeficiency Virus Type 1-infected Donors." Proc Natl Acad Sci U S A 1993.

Haffar, O K., et al. "Costimulation of T-cell Activation and Virus Production By B7 Antigen On Activated CD4+ T Cells From Human Immunodeficiency Virus Type 1-infected Donors." Proc Natl Acad Sci U S A 1993.