Abstract
This research is supported by the Natural Science Foundation of China (11071143, 60904024, 61174217), Natural Science Outstanding Youth Foundation of Shandong Province (JQ201119) and supported by Shandong Provincial Natural Science Foundation (ZR2010AL002, ZR2009AL003), also supported by Natural Science Foundation of Educational Department of Shandong Province (J11LA01). S. Sun · Z. Han ( ) · T. Li School of Mathematical Sciences, University of Jinan, Jinan, Shandong 250022, P.R. China e-mail: hanzhenlai@163.com
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