M. Martínez S. García-Nieto Javier Sanchis Xavier Blasco Ferragud Genetic algorithms optimization for normalized normal constraint method under Pareto construction. 260-267 2009 40 Advances in Engineering Software 4 http://dx.doi.org/10.1016/j.advengsoft.2008.04.004 db/journals/aes/aes40.html#MartinezGSB09