@article{IVM_1972_4_a6,
     author = {G. L. Gasilov},
     title = {The characteristic equation of a~system of linear differential equations with periodic coefficients and lags},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {60--66},
     publisher = {mathdoc},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_4_a6/}
}