TY  - JOUR
AU  - He, Ziyi
AU  - Yang, Dachun
AU  - Yuan, Wen
TI  - Littlewood–Paley Characterizations of Second-Order Sobolev Spaces via Averages on Balls
JO  - Canadian mathematical bulletin
PY  - 2016
SP  - 104
EP  - 118
VL  - 59
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-2015-038-9/
DO  - 10.4153/CMB-2015-038-9
ID  - 10_4153_CMB_2015_038_9
ER  -