%0 Journal Article %A F. BaraƄski %T The mean value theorem and oscillatory properties of certain elliptic equations in three dimensional space %J Commentationes Mathematicae %D 1976 %P 13-14 %V 19 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/cm.v19i1.5833/ %R 10.14708/cm.v19i1.5833 %G pl %F 10_14708_cm_v19i1_5833