David McSherry David W. Aha Mixed-Initiative Relaxation of Constraints in Critiquing Dialogues. 107-121 2007 conf/iccbr/2007 ICCBR http://dx.doi.org/10.1007/978-3-540-74141-1_8 db/conf/iccbr/iccbr2007.html#McSherryA07