@article{MZ_1988__197_1_183731,
     author = {Reinhard B\"urger},
     title = {Perturbations of {Positive} {Semigroups} and {Applications} to {Population} {Genetics.}},
     journal = {Mathematische Zeitschrift},
     pages = {259--272},
     publisher = {mathdoc},
     volume = {197},
     number = {1},
     year = {1988},
     zbl = {0618.47036},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183731/}
}