@article{iiasa4324,
           title = {Immune response against multiple epitopes},
       publisher = {Elsevier},
            year = {1995},
           pages = {325--353},
         journal = {Journal of Theoretical Biology},
             url = {https://pure.iiasa.ac.at/id/eprint/4324/},
            issn = {1095-8541},
          author = {May, R. M. and Nowak, M. A. and Sigmund, K.}
}