@article{SM_1971_14_4_a0,
     author = {I. M. Sonin},
     title = {On uniqueness classes for degenerating parabolic equations},
     journal = {Sbornik. Mathematics},
     pages = {453--469},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_14_4_a0/}
}