@book{56,
	author = {Prager, B. and Richter, F.},
	title = {Beilsteins handbuch der Organischen chemie Supplementary Band (vol-13 to 14)},
	publisher = {Berlin Verlag Von Julius Springer},
	year = {1933},
	series = {13 to 14},
	address = {Berlin}
}