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200 1 $a<<A >>Lagrangean Heuristic for the Prize Collecting Travelling Salesman Problem$fdi Mauro Dell'Amico, F. Maffioli, A. Sciomachen
225 1 $aMateriali di discussione$fDipartimento di economia politica. Università di Modena$v142
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702  1$aSciomachen,$bA.
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