@book{16710,
	author = {Hubbes, Martin.},
	title = {Host-parasite in the Hypoxylon canker of aspen},
	note = {Sobretiro de : Breeding Pest-Resistant Trees Proc. NATO and NSF Symp. Pennsylvania State Univ. 1964. Oxford, Pergamon Press, 1966 pp. 229-238}
}