Animated agents and learning: Does the type of verbal feedback they provide matter? - Lijia Lin; Robert K. Atkinson; Robert Christopherson; Stacey S. Joseph; Caroline J. Harrison (Comput. Educ., 2013)

Searching for the two sigma advantage: Evaluating algebra intelligent tutors. - Kent E. Sabo; Robert K. Atkinson; Angela L. Barrus; Stacey S. Joseph; Ray S. Perez (Comput. Hum. Behav., 2013)