D. Weikle, M. Lam, and M. Kirkpatrick. Proceedings of the 50th ACM Technical Symposium on Computer Science Education, page 565--570. New York, NY, USA, ACM, (2019)
P. Sharma, A. Roy, B. Nath, and Y. Shchekinov. (2014)cite arxiv:1402.6695Comment: 15 pages, 9 figures; abstract abridged; submitted to MNRAS; comments welcome.