TY  - JOUR
AU  - Xie, Guangheng
AU  - Yang, Dachun
AU  - Yuan, Wen
TI  - Pointwise Characterizations of Even Order Sobolev Spaces via Derivatives of Ball Averages
JO  - Canadian mathematical bulletin
PY  - 2019
SP  - 681
EP  - 699
VL  - 62
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/S000843951800005X/
DO  - 10.4153/S000843951800005X
ID  - 10_4153_S000843951800005X
ER  -