@book{4624,
	author = {Lewak, Stanislaw. and Dziewanowska, Katarzyna.},
	title = {Polymeric flavans of the hawthorn leaves (Crataegus oxyacantha)},
	note = {Sobretiro de: Ann. Soc Chim Polonorum 44: 1733-1739, 1970.}
}