@book{246910,
	author = {Pilbeam, John and Weightman, Bill},
	title = {Gymnocalycium : a collector's guide},
	publisher = {A. a. Balkema},
	year = {1995},
	address = {Rotterdam},
	note = {Donación Dres. Beat E. Leuenberger y Silvia Arroyo}
}