%0 Journal Article %A B. V. Dekster %T Certain integral estimates for three-dimensional PM manifolds %J Sbornik. Mathematics %D 1970 %P 245-265 %V 10 %N 2 %U http://geodesic.mathdoc.fr/item/SM_1970_10_2_a6/ %G en %F SM_1970_10_2_a6