%0 Journal Article %A Rotondaro, Giovanni %T An integral formula for closed surfaces and a generalization of $Hp$-theorem %J Commentationes Mathematicae Universitatis Carolinae %D 1988 %P 253-254 %V 29 %N 2 %U http://geodesic.mathdoc.fr/item/CMUC_1988_29_2_a6/ %G en %F CMUC_1988_29_2_a6