@book{60557,
	author = {Ghazal, F. M.  and El-Beltagy, A. E.},
	title = {Characterization and identification of nitrogen fixing cyanobacteria in Egyptian sandy and alluvial (clay loam) soils },
	url = {http://nile.enal.sci.eg/EALE/2015/MJAR/4015/5/1261.pdf}
}