Chowdhury, Fatema. Essentials of number theory / Fatema Chowdhury and Munibur Rahman Chowdhury. - Dhaka : Pi Publications, c2005. - 224p. : ill. ; 26 cm. ISBN: 9843228367 250.00 Subjects--Topical Terms: Mathematics.Mathematical analysis.Calculus. Dewey Class. No.: 512.7