Em tìm được mấy bài cần cho cái thesis mà hok down được, nhờ mấy anh chị down giùm
http://www.sciencedirect.com/science/article/pii/S0141022908002627
http://www.springerlink.com/content/th140277120v1703/
http://www.sciencedirect.com/science/article/pii/S1369703X06002968...
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