@book{13434,
	author = { Andrade Arévalo, H.F},
	url = { http://fausac.usac.edu.gt/tesario/tesis/CEDIA-01923.pdf},
	title = {Growth analysis, grain yield and yield components  of corn as influenced by ethephon.},
	address = {EE.UU,},
	publisher = {Cornell University. Faculty of the Graduate School:},
	year = {c1987}
}