@article{DAN_1994_335_6_a2,
     author = {V. P. Glushko and S. A. Tkacheva},
     title = {On the heat equation with an essentially variable coefficient},
     journal = {Doklady Akademii Nauk},
     pages = {684--687},
     publisher = {mathdoc},
     volume = {335},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_6_a2/}
}