Aiying Rong José Rui Figueira Kathrin Klamroth Dynamic programming based algorithms for the discounted {0-1} knapsack problem. 6921-6933 2012 218 Appl. Math. Comput. 12 https://doi.org/10.1016/j.amc.2011.12.068 db/journals/amc/amc218.html#RongFK12