@article{MZM_1986_39_6_a4,
     author = {V. F. Butuzov and L. V. Kalachev},
     title = {Asymptotic approximation of solution of boundary-value problem for singularly disturbed parabolic equation in the critical case},
     journal = {Matemati\v{c}eskie zametki},
     pages = {819--830},
     publisher = {mathdoc},
     volume = {39},
     number = {6},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_6_a4/}
}