@article{DE_1997_33_2_a19,
     author = {I. M. Cherevko},
     title = {An estimate for the fundamental matrix of singularly perturbed functional-differential equations and some of its applications},
     journal = {Differencialʹnye uravneni\^a},
     pages = {281--283},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_2_a19/}
}