Richard Bowden Liam Ellis Josef Kittler Mikhail Shevchenko David Windridge Unsupervised Symbol Grounding and Cognitive Bootstrapping in Cognitive Vision. 27-36 2005 conf/iciap/2005 ICIAP http://dx.doi.org/10.1007/11553595_4 db/conf/iciap/iciap2005.html#BowdenEKSW05