@book{1272,
	author = {Vasishtha, A. R. and Vasishtha, Vipin},
	title = {Calculus of finite differences and numerical analysis (a course on numerical methods)  /},
	publisher = {K. R. Nath,},
	year = {c2018-2019.},
	address = {New Delhi:},
	edition = {4th ed.}
}