@book{2284,
	author = {Simson, Otto von, 1912-1993. and Boase, T. S. R. 1898-1974 (Thomas Sherrer Ross),},
	title = {Das Mittelalter II : das Hohe Mittelalter /},
	publisher = {Propyläen Verlag},
	year = {1972},
	address = {Berlin :}
}