@book{4176,
	author = {Das, B.C. and Mukherjee, B. N.},
	title = {Differential calculus /},
	publisher = {U.N. Dhur & Sons.Private Ltd.,},
	year = {c1979 [Reprinted 2012].},
	address = {Calcutta :},
	edition = {51st ed.},
	note = {Includes index.}
}