@book{43304,
	author = {EI-Masry, T. A. and Gadallah, F. M.},
	title = {Response of growth and productivity of leek (Allium porrum L.) to nitrogen and potassium fertilization},
	url = {http://nile.enal.sci.eg/EALE/2006/AASM/4406/3/1181.pdf}
}