@book {181975,
	title = {Binary System with Varying Mass},
	year = {2011},
	publisher = {LAP Lambert Academic Publishing AG \& Co. KG},
	organization = {LAP Lambert Academic Publishing AG \& Co. KG},
	address = {Germany},
	author = {Walid Ali  Rahoma and M. K. Ahmed and F. Abd El-Salam}
}
