00491nam a2200181Ia 4500 CTU_78538 210402s9999 xx 000 0 und d 510 P218 Pappas, Theoni The magic of mathematics : Discovering the spell of mathematics Theoni Pappas Tetra Wide World Publishing 1994 Mathematics Trung tâm Học liệu Trường Đại học Cần Thơ