@book{193363,
	author = {Breucker, Haide and Springer-Verlag (Berlin).},
	title = {Seasonal sparmatogenesis in the mute swan (Cynus olor) /},
	publisher = {Springer-Verlag, },
	year = {1982.},
	series = {Advances in Anatomy, Embryology and Cell Biology ;},
	address = {Berlin : Springer-Verlag, }
}