%0 Journal Article %A Xu, Wang %A Zhou, Xiangyu %T Optimal $L^2$ Extensions of Openness Type and Related Topics %J Comptes Rendus. Mathématique %D 2023 %P 679-683 %V 361 %N G3 %I Académie des sciences, Paris %U http://geodesic.mathdoc.fr/articles/10.5802/crmath.437/ %R 10.5802/crmath.437 %G en %F CRMATH_2023__361_G3_679_0