HAEHLING CHRISTOPH. (1975). CASES IN OPERATIONAL RESEARCH. HOLDEN DAY.
Lua i Stíl Chicago (17ú heag.)HAEHLING CHRISTOPH. CASES IN OPERATIONAL RESEARCH. LONDON: HOLDEN DAY, 1975.
Lua MLA (9ú heag.)HAEHLING CHRISTOPH. CASES IN OPERATIONAL RESEARCH. HOLDEN DAY, 1975.
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