000, 0000.MathSciNetCrossRefMATH  M. Held and R.M. Karp. The traveling-salesman problem and minimum spanning trees. Operations Research, 00:0000-0000, 0000.MathSciNetCrossRefMATH  A.J. Higgins, S. Hajkowicz, and E. Bui. A multi-objective model for environmental investment decision making. Computers & Operations Research, 00:000-000, 0000.CrossRefMATH  C. Ishida, A. Pozo, E. Goldbarg, and M. Goldbarg. Multiobjective optimization and rule learning: Subselection algorithm or meta-heuristic algorithm? In N. Nedjah, L.M. Mourelle, and J. Kacprzyk, editors, Innovative applications in data mining