@book{62534,
	author = {Martínez Colín, Marco Antonio.},
	title = {Desarrollo del saco embrional de Crataegus pubescens (HBK) Steud. (Rosaceae : Maloideae)},
	publisher = {El autor,},
	year = {1997},
	address = {Chapingo, Méx. :}
}