Cristina Bazgan Hadrien Hugot Daniel Vanderpooten Implementing an efficient fptas for the 0-1 multi-objective knapsack problem. 47-56 2009 198 European Journal of Operational Research 1 http://dx.doi.org/10.1016/j.ejor.2008.07.047 db/journals/eor/eor198.html#BazganHV09