@book{21657,
	author = {Freeman, Harry},
	title = {Finite differences for actuarial students /},
	publisher = {Institute of Actuaries at the university press,},
	year = {1967.},
	address = {Cambridge [England] :},
	edition = {2nd ed.},
	note = {First ed. published as Mathematics for actuarial students, Part II.}
}