@book{58303,
	author = {"Boer den, P.J. & Gradwell, G.R., Ed."},
	title = {" Advanced study institute on dynamics of numbers in populations, Oosterback, Sep. 7-18, 1970.Dynamics of populations : Proceedings Edited by P.J.den Doer and G.R.Gradwell"},
	publisher = {Centre for Agric.Publishing & Documentation},
	year = {Netherlands},
	address = {1971}
}