RT Journal Article SR 00 A1 May, R.M. A1 Nowak, M.A. A1 Sigmund, K. T1 Immune response against multiple epitopes JF Journal of Theoretical Biology YR 1995 FD 1995 SP 325 OP 353 PB Elsevier SN 1095-8541 LK https://pure.iiasa.ac.at/id/eprint/4324/