@article{DE_1977_13_10_a13,
     author = {V. F. Butuzov},
     title = {The construction of boundary functions in certain singularly perturbed problems of elliptic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1829--1835},
     publisher = {mathdoc},
     volume = {13},
     number = {10},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_10_a13/}
}