Muralikrishna Sridhar Anthony G. Cohn David C. Hogg Learning Functional Object-Categories from a Relational Spatio-Temporal Representation. 606-610 2008 ECAI http://dx.doi.org/10.3233/978-1-58603-891-5-606 conf/ecai/2008 db/conf/ecai/ecai2008.html#SridharCH08