@book{74687,
	author = {Hemdan Hanafy Shalaby Metwally  and Abdalla Hanafy , },
	title = {Thermal Performance of salinity geadient solar ponds / },
	publisher = {Hemdan Hanafy Shalaby Metwally , },
	year = {1997},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}