@article{DAN_1994_338_5_a4,
     author = {S. A. Lomov},
     title = {Exactly solvable singularly perturbed problems},
     journal = {Doklady Akademii Nauk},
     pages = {595--597},
     publisher = {mathdoc},
     volume = {338},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_338_5_a4/}
}