@book{42999,
	author = {Babeau, André  and Derycke, Pierre-henri },
	title = {Problèmes Techniques De Planification \},
	publisher = {Éditions Sirey, },
	year = {1967.},
	series = {L'économique ;},
	address = {Paris :},
	note = {Comprend un index.},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B13-07532.pdf}
}