B. Rienties, L. Toetenel, and A. Bryan. Proceedings of the Fifth International Conference on Learning Analytics And Knowledge, page 315-319. New York, NY, USA, ACM, (2015)
M. Ribeiro, S. Singh, and C. Guestrin. Proceedings of the 22nd ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, ACM, (August 2016)Available at https://arxiv.org/pdf/1602.04938.pdf.