@book{52861,
	author = {Wulff, Eugenii Vladimirovich.},
	title = {An introduction to historical plant geography},
	publisher = {Chonica Botanica,},
	year = {1950},
	series = {New series of plant science books},
	address = {Waltham :},
	note = {Ed. de 1943, idéntica}
}