@book {6383,
	title = {An den Grenzen des Wissens. Vom Beitrag der Biologie zu einem neuen Weltbild},
	year = {1973},
	pages = {2630},
	publisher = {Econ Verlag},
	organization = {Econ Verlag},
	address = {D{\"u}sseldorf and Wien},
	author = {Portmann, Adolph}
}
