@article{10_4153_CJM_2014_038_1,
     author = {Zhang, Junqiang and Cao, Jun and Jiang, Renjin and Yang, Dachun},
     title = {Non-tangential {Maximal} {Function} {Characterizations} of {Hardy} {Spaces} {Associated} with {Degenerate} {Elliptic} {Operators}},
     journal = {Canadian journal of mathematics},
     pages = {1161--1200},
     year = {2015},
     volume = {67},
     number = {5},
     doi = {10.4153/CJM-2014-038-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2014-038-1/}
}