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Чикаго-гийн эшлэл (17 дахь хэвлэлт)taha, hamdy a. An Optimal Policy for Machine Tool Replacement. cairo: the institute of national planning, 1964.
MLA -ийн эшлэл (9 дэх хэвлэлт)taha, hamdy a. An Optimal Policy for Machine Tool Replacement. the institute of national planning, 1964.