@BOOK{ Book!D - 103372174,
AUTHOR = "/ Titu Andreescu, Zuming Feng",
TITLE = "103 trigonometry problems",
LIBRARY= "كتابخانه مركزی و مركز اسناد دانشگاه شهيد چمران",
SUBJECT = "Trigonometry--Problems, exercises, etc",
URL = "/book/103372174/103-trigonometry-problems/"}