@BOOK{ Book!D - 103044035,
AUTHOR = "",
TITLE = "Non-Euclidean geometry",
LIBRARY= "کتابخانه مرکزی و مرکز اسناد دانشگاه کردستان",
SUBJECT = "Geometry, Non-Euclidean",
URL = "/book/103044035/NonEuclidean-geometry/"}