@article{MZM_1997_62_4_a1,
     author = {Yu. A. Konyaev},
     title = {Singularly perturbed problems with double singularity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {494--501},
     publisher = {mathdoc},
     volume = {62},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_4_a1/}
}