@book{14715,
	author = {Gottner, Habil Reinhard. and The Institute of National Planning.},
	title = {On The Planning Method "PERT" and its Application in the GDR / },
	publisher = {The Institute of National Planning, },
	year = {1968.},
	series = {مذكره خارجية},
	address = {Cairo : }
}