

@article {4156,
	title = {{Sewage sludge: An important biological resource for sustainable agriculture and its environmental implications}},
	journal = {American Journal of Plant Sciences},
	volume = {2},
	year = {2012},
	pages = {1708{\textendash}1721},
	author = {Usman, K and Khan, S and Ghulam, S and Khan, MU and Khan, N and Khan, MA and Khalil, SK}
}
