@book {2426,
	title = {Knowledge: Its Creation, Distribution, and Economic Significance},
	volume = {II},
	year = {1984},
	publisher = {Princeton University Press},
	organization = {Princeton University Press},
	address = {Princeton},
	author = {Machlup, Fritz}
}
@book {2425,
	title = {Knowledge: Its Creation, Distribution, and Economic Significance},
	volume = {I},
	year = {1980},
	publisher = {Princeton University Press},
	organization = {Princeton University Press},
	address = {Princeton},
	author = {Machlup, Fritz}
}
@book {434,
	title = {Kunst der Farbe. Subjektives Erleben und objektives Erkennen als Wege zur Kunst},
	year = {1961},
	publisher = {Christophorus Verlag},
	organization = {Christophorus Verlag},
	edition = {2},
	address = {Freiburg im Bresgau},
	author = {Itten, Johannes}
}
