@article{VMUMM_1993_4_a3,
     author = {O. A. Demidova},
     title = {On a mathematical model in epidemiology},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {14--17},
     year = {1993},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_4_a3/}
}