@BOOK{ Book!D - 90225012,
AUTHOR = " Chris McMullen, Ph.D.",
TITLE = "50 challenging algebra problems :",
LIBRARY= "مرکز و کتابخانه مطالعات اسلامی به زبان‌های اروپایی",
SUBJECT = "Algebra, Problems, exercises, etc.,Algebra.",
URL = "/book/90225012/50-challenging-algebra-problems/"}