%0 Journal Article %A V. V. Grushin %T On a class of elliptic pseudodifferential operators degenerate on a submani­fold %J Sbornik. Mathematics %D 1971 %P 155-185 %V 13 %N 2 %U http://geodesic.mathdoc.fr/item/SM_1971_13_2_a0/ %G en %F SM_1971_13_2_a0