A. Ambrus, I. Hortobágyi, M. Näätänen, R. Liira, and M. Salmela, “Why do we complicate the solution of the problem? reflection of Finnish students and teachers on a mathematical summer camp”, Teach. Math. Comp. Sci., vol. 4, no. 2, pp. 405–415, Dec. 2006, doi: 10.5485/TMCS.2006.0138.