L. Prieto, K. Sharma, Y. Wen, and P. Dillenbourg. Proceedings of the 11th International Conference on Computer-Supported Collaborative Learning (CSCL 2015), page 212-219. Gothenburg Sweden, (2015)
H. Mellar, M. Oliver, and C. Hadjithoma-Garstka. Transforming Higher Education through Technology-Enhanced Learning, Higher Education Academy, York, UK, (2009)