%0 Journal Article %A Novotná, Jarmila %T Discrete analogues of Wirtinger's inequality for a two-dimensional array %J Časopis pro pěstování matematiky %D 1980 %P 354-362 %V 105 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1980.108245/ %R 10.21136/CPM.1980.108245 %G en %F 10_21136_CPM_1980_108245