@article{SM_1988_59_1_a3,
     author = {G. A. Isaev},
     title = {Singular multiparameter differential operators. {Expansion} theorems},
     journal = {Sbornik. Mathematics},
     pages = {53--73},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1988_59_1_a3/}
}