%0 Journal Article %A I. S. Gudovich %T On the method of orthogonal extension of overdetermined systems %J Sbornik. Mathematics %D 1974 %P 456-464 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1974_22_3_a6/ %G en %F SM_1974_22_3_a6