C. Zahn. SIGCSE '87: Proceedings of the eighteenth SIGCSE technical symposium on Computer science education, стр. 264--266. New York, NY, USA, ACM, (1987)
P. McIlroy. SODA '93: Proceedings of the fourth annual ACM-SIAM Symposium on Discrete algorithms, стр. 467--474. Philadelphia, PA, USA, Society for Industrial and Applied Mathematics, (1993)
E. Demaine, A. López-Ortiz, и J. Munro. SODA '00: Proceedings of the eleventh annual ACM-SIAM symposium on Discrete algorithms, стр. 743--752. Philadelphia, PA, USA, Society for Industrial and Applied Mathematics, (2000)
C. Kim, S. Yoon, и D. Kim. ACC'08: Proceedings of the WSEAS International Conference on Applied Computing Conference, стр. 120--123. Stevens Point, Wisconsin, USA, World Scientific and Engineering Academy and Society (WSEAS), (2008)