@book{40763,
	author = {Sabh, A. Z. E. and Ali, I. H. H.},
	title = {Allelopathic activity of nightshade (Solanum nigrum L.) on seedling growth of certain weeds and crops},
	url = {http://nile.enal.sci.eg/EALE/2010/AAS/5510/1/87.pdf}
}