Meira, L.; and Lerman, S. 2001. The zone of proximal development as a symbolic space. South Bank University.
Perez-Liebana, D.; et al. 2016. The 2014 general video game playing competition. IEEE Trans. Comp. Intel. and AI in Games 8(3).
Resnick, M. 2007. All I really need to know (about creative thinking) I learned (by studying how children learn) in kindergarten. ACM SIGCHI Conf. on Creativity & Cognition (C&C '07).