%0 Journal Article
%A He, Ziyi
%A Yang, Dachun
%A Yuan, Wen
%T Littlewood–Paley Characterizations of Second-Order Sobolev Spaces via Averages on Balls
%J Canadian mathematical bulletin
%D 2016
%P 104-118
%V 59
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2015-038-9/
%R 10.4153/CMB-2015-038-9
%F 10_4153_CMB_2015_038_9