Ivan B. Liss, Thomas C. McMillan. Fractals with turtle graphics: a CS2 programming exercise for introducing recursion. In A. K. Rigler, Daniel C. St. Clair, editors, Proceedings of the 18st SIGCSE Technical Symposium on Computer Science Education, 1987, St. Louis, Missouri, USA, February 19-20, 1987. pages 141-147, ACM, 1987. [doi]
Abstract is missing.