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1. Approximation Algorithms for 3D Orthogonal Knapsack
   Florian Diedrich, Rolf Harren, Klaus Jansen, Ralf Thöle, and Henning Thomas
   In: Theory and Applications of Models of Computation, Shanghai, China, 2007, 34-45
   [PDF: Download: Approximation Algorithms for 3D Orthogonal Knapsack (TAMC07).pdf]