@book{67371,
	author = {Dickson, T. A.},
	title = {Studies in Crataegus (Rosaceae : maloideae) IX. Shortshoot leaf heteroblasty in Crataegus Crus-galli sensu lato},
	note = {Sobretiro de: Can J. Bot. 62 : 175 - 1780, 1984}
}