@book {Bloch1967,
	title = {Die Ottonische K{\"o}lner Malerschule},
	volume = {1},
	year = {1967},
	publisher = {Schwann},
	organization = {Schwann},
	address = {D{\"u}sseldorf},
	author = {Bloch, Peter and Schnitzler, Herman}
}
