@book{55770,
	author = {Abd El-Fattah, M. A. and Sorial, Mervat E.},
	title = {Sex expression response of spinach as affected by biofertilizer and GA₃ application and its relation to yield, quality and seed production},
	url = {http://nile.enal.sci.eg/EALE/2003/MUJAS/2803/10/7375.pdf}
}