@article{MZM_1998_63_3_a3,
     author = {V. F. Butuzov and N. N. Nefedov},
     title = {A singularly perturbed boundary value problem for a second-order equation in the case of variation of stability},
     journal = {Matemati\v{c}eskie zametki},
     pages = {354--362},
     publisher = {mathdoc},
     volume = {63},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_3_a3/}
}