Ivon Arroyo David G. Cooper Winslow Burleson Beverly Park Woolf Kasia Muldner Robert Christopherson Emotion Sensors Go To School. 17-24 2009 AIED http://dx.doi.org/10.3233/978-1-60750-028-5-17 conf/aied/2009 db/conf/aied/aied2009.html#ArroyoCBWMC09