Johannes Bader Dimo Brockhoff Samuel Welten Eckart Zitzler On Using Populations of Sets in Multiobjective Optimization. 140-154 2009 EMO http://dx.doi.org/10.1007/978-3-642-01020-0_15 conf/emo/2009 db/conf/emo/emo2009.html#BaderBWZ09