@book{4173,
	author = {Das, B. C.  and  Mukherjee, B. N.},
	title = {Differential calculus /},
	publisher = {U. N. Dhur & Sons,},
	year = {2014.},
	address = {Kolkata : },
	edition = {54th ed.},
	note = {Important chapter and examples added in this edition.}
}