AM-FM model of gravity tide IMF and its non-linear data fitting
WU Qing-chang 1,ZHOU Zhi 2,LIANG Hong 3,QUAN Hai-yan 3,4,WANG Tian-li 3
Computer Engineering and Applications . 2009, (30): 138 -142 .  DOI: 10.3778/j.issn.1002-8331.2009.30.043