@BOOK{ Book!D - 90030932,
AUTHOR = " W.D. Wallis",
TITLE = "A beginner's guide to discrete mathematics",
LIBRARY= "مرکز و کتابخانه مطالعات اسلامی به زبان‌های اروپایی",
SUBJECT = "Computer science-- Mathematics, Textbooks,Mathematics, Textbooks",
URL = "/book/90030932/A-beginners-guide-to-discrete-mathematics/"}