%0 Journal Article %A Haim Brezis %A Alfred Bruckstein %T A sharp relative isoperimetric inequality for the square %J Comptes Rendus. Mathématique %D 2021 %P 1191-1199 %V 359 %N 9 %I Académie des sciences, Paris %R 10.5802/crmath.243 %G en %F CRMATH_2021__359_9_1191_0