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Ikonomiko-matematičeski metodi i modeli v tărgovijata : (izsledvane na operaciite)
Aleksandrov, Krum S., (1989)
Advances in optimization and control : proceedings of the Conference "Optimization Days 86", held at Montreal, Canada, April 30 - May 2, 1986
Eiselt, Horst A., (1988)
International business studies : an overview
Buckley, Peter J., (1992)