@BOOK{ Book!D - 103044589,
AUTHOR = "/ D. Hilbert and S. Cohn-Vossen ",
TITLE = "Geometry and the imagination",
LIBRARY= "کتابخانه مرکزی و مرکز اسناد دانشگاه کردستان",
SUBJECT = "Geometry, Non-Euclidean",
URL = "/book/103044589/Geometry-and-the-imagination/"}