@article{DE_1978_14_9_a12,
     author = {E. F. Lelikova},
     title = {The method of matching asymptotic expansions for the equation $\varepsilon\Delta u-au_z=f$ in a parallelepiped},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1638--1648},
     publisher = {mathdoc},
     volume = {14},
     number = {9},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_9_a12/}
}