%0 Journal Article %A Brezis, Haïm %T Comments on two Notes by L. Ma and X. Xu %J Comptes Rendus. Mathématique %D 2011 %P 269-271 %V 349 %N 5-6 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2011.01.024/ %R 10.1016/j.crma.2011.01.024 %G en %F CRMATH_2011__349_5-6_269_0