@article{DAN_1979_247_3_a2,
     author = {Yu. P. Boglaev},
     title = {The generalized {Frobenius} formula in singularly perturbed linear equations},
     journal = {Doklady Akademii Nauk},
     pages = {528--531},
     publisher = {mathdoc},
     volume = {247},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_3_a2/}
}