PreK Teachers & Students Using Multi-Touch Virtual Manipulatives: An Analysis of Usability and Learner-centered Design. - Michael A. Evans; Jeremy Crider; Andrea Motto; Adrienne Brunger; Jesse L. M. Wilkins (CSCL, 2011)

Group Meaning in Mathematical Discourse: A Multimodal Analysis of PreK Students Using Multi-Touch Virtual Manipulatives. - Michael A. Evans; Jesse L. M. Wilkins; Andrea Motto; Adrienne Brunger; Jeremy Crider (CSCL, 2011)