John J. H. Forrest Jayant Kalagnanam Laszlo Ladányi A Column-Generation Approach to the Multiple Knapsack Problem with Color Constraints. 129-134 2006 18 INFORMS J. Comput. 1 https://doi.org/10.1287/ijoc.1040.0078 db/journals/informs/informs18.html#ForrestKL06