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Message * Iv Sankt-Peterburgskai︠a︡ Mezhdunarodnai︠a︡ Konferent︠s︡ii︠a︡ Po Integrirovannym Navigat︠s︡ionnym Sistemam, 26-28 Mai︠a︡ 1997 G. - 5900780120 - 9785900780122