@article{MZM_1990_47_2_a11,
     author = {E. V. Radkevich},
     title = {Operator bundles of the contact {Stefan} problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {89--101},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_2_a11/}
}