%0 Journal Article %E Grötschel, Martin %T Special issue: Optimization stories. Selected papers based on the presentations at the 21st international symposium on mathematical programming, ISMP, Berlin, Germany, August 19--24, 2012 %J Documenta mathematica %D 2012 %V Optimization Stories %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2012__S3__a44/ %G en %F DOCMA_2012__S3__a44