Clemens Eppner Jürgen Sturm Maren Bennewitz Cyrill Stachniss Wolfram Burgard Imitation learning with generalized task descriptions. 3968-3974 2009 ICRA http://dx.doi.org/10.1109/ROBOT.2009.5152466 conf/icra/2009 db/conf/icra/icra2009.html#EppnerSBSB09