@article{IVM_1998_4_a3,
     author = {V. G. Il'ichev},
     title = {Delta functions and the investigation of {Volterra} ecological models in a~changing environment},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {23--33},
     publisher = {mathdoc},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1998_4_a3/}
}