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Problemǔt za teoretičnite osnovi na sǔvresmennoto ikonomiko-matematičesko modelirane
Biljarski, Dimitŭr, (1981)
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Minimum norm problems over transportation polytopes
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Mathematische Modelle für Bausparkollektive
Bachem, Achim, (1988)
Primal and dual methods for updating input-qutput-matrices