Freedman, Freeman, Horowitz et al.: "B7, a B-cell-restricted antigen that identifies preactivated B cells." in: Journal of immunology (Baltimore, Md. : 1950), Vol. 139, Issue 10, pp. 3260-7, 1987 (PubMed).
Freeman, Freedman, Segil et al.: "B7, a new member of the Ig superfamily with unique expression on activated and neoplastic B cells." in: Journal of immunology (Baltimore, Md. : 1950), Vol. 143, Issue 8, pp. 2714-22, 1989 (PubMed).
Vallé, Garrone, Yssel et al.: "mAb 104, a new monoclonal antibody, recognizes the B7 antigen that is expressed on activated B cells and HTLV-1-transformed T cells." in: Immunology, Vol. 69, Issue 4, pp. 531-5, 1990 (PubMed).
Linsley, Clark, Ledbetter: "T-cell antigen CD28 mediates adhesion with B cells by interacting with activation antigen B7/BB-1." in: Proceedings of the National Academy of Sciences of the United States of America, Vol. 87, Issue 13, pp. 5031-5, 1990 (PubMed).
June, Ledbetter, Linsley et al.: "Role of the CD28 receptor in T-cell activation." in: Immunology today, Vol. 11, Issue 6, pp. 211-6, 1990 (PubMed).
Vallé, Aubry, Durand et al.: "IL-4 and IL-2 upregulate the expression of antigen B7, the B cell counterstructure to T cell CD28: an amplification mechanism for T-B cell interactions." in: International immunology, Vol. 3, Issue 3, pp. 229-35, 1991 (PubMed).