J. Ángel Velázquez-Iturbide. Recursion in gradual steps (is recursion really that difficult?). In Boots Cassel, Nell B. Dale, Henry MacKay Walker, Susan M. Haller, editors, Proceedings of the 31st SIGCSE Technical Symposium on Computer Science Education, 2000, Austin, Texas, USA, March 7-12, 2000. pages 310-314, ACM, 2000. [doi]
Abstract is missing.