@article{DAN_1975_224_1_a2,
     author = {A. B. Vasil'eva},
     title = {Singularly perturbed systems containing indeterminacy in the case of degeneracy},
     journal = {Doklady Akademii Nauk},
     pages = {19--22},
     publisher = {mathdoc},
     volume = {224},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_1_a2/}
}