中国科学院数学与系统科学研究院期刊网
JCM
Littlewood–Paley g–function on the Heisenberg Group
He Ping Liu, Rui Qin Ma
Acta Mathematica Sinica . 2006, (1): 95 -100 .  DOI: 10.1007/s10114-004-0469-1