%0 Journal Article %A Zhang, Junqiang %A Cao, Jun %A Jiang, Renjin %A Yang, Dachun %T Non-tangential Maximal Function Characterizations of Hardy Spaces Associated with Degenerate Elliptic Operators %J Canadian journal of mathematics %D 2015 %P 1161-1200 %V 67 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2014-038-1/ %R 10.4153/CJM-2014-038-1 %F 10_4153_CJM_2014_038_1