@book{249039,
	author = {Dalla Zuanna Gianpiero and  Gavini Stefano},
	title = {The Effect of Changing Sexual Marital and Contraceptive Behaviour on Conceptions Abortions and Births},
	year = {1998},
	edition = {1a ed.},
	note = { Tema: popolazione, natalità, contraccezione, aborto}
}