@book{44420,
	author = {Refale, H. M. and Abd-Elhafez, A. A. M.},
	title = {Effect of solarization, organic and biofertilizer on growth and yield of baby and mature spinach leaf (spinacia oleracea)},
	url = {http://nile.enal.sci.eg/EALE/2010/AAS/5510/2/295.pdf}
}