http://s43.yousendit.com/d.aspx?id=3RLK8I2P64PVD1K4MTETQ6RXMA
Chuc vui ve,
Hieu
PS. cap nhat thong tin tai
http://www.thuvienkhoahoc.com/tusach/Lecture:Sinh_h%E1%BB%8Dc_%C4%90%E1%BA%A1i_c%C6%B0%C6%A1ng_MIT_7.013