@book{53874,
	author = {Wiersema, Siert G.},
	title = {The production and utilization of seed tubers derived fromm true potato seed},
	publisher = {International Potato Center,},
	year = {1984},
	address = {Lima :},
	note = {Publicación orginalmente como tesis para obtener el grado de Dr. en Filosofía de la Universidad de Reading, England, 1984}
}