Mathematical Theory and Applications ›› 2016, Vol. 36 ›› Issue (3): 48-53.
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Liu Dongyan1, Fan Sujun1, Wang Bing2
1.Basic MedicalCollege,Hebei Medical University,Shijiazhuang 050017,China; 2.Financial Department,Sinopec Sales Co.,Ltd.,Hebei Petroleum Branch,Shijiazhuang 050000,China