@article{ZAA_2000__19_1_48744,
     author = {M\"uller, J. and Hadeler, K.P.},
     title = {Monotonicity of the number of passages in linear chains and of the basis reproduction number in epidemic models.},
     journal = {Zeitschrift f\"ur Analysis und ihre Anwendungen},
     pages = {61--75},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2000},
     zbl = {0961.92028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZAA_2000__19_1_48744/}
}