Das, B. C. Differential calculus / B. C. Das, B. N. Mukherjee. - 43rd ed. - Calcutta : U.N. Dhur, 1997. - xvi, 475 p. ; 18 c.m. Subjects--Topical Terms: Calculus--Differential calculus. Dewey Class. No.: 515.3 / DAD