M. Shishibori, M. Okada, T. Sumitomo, and J. ichi Aoe. Stringology, page 1-11. Department of Computer Science and Engineering, Faculty of Electrical Engineering, Czech Technical University, (1997)
K. Ando, K. Iwasaki, M. Fuketa, and J. ichi Aoe. Stringology, page 1-13. Department of Computer Science and Engineering, Faculty of Electrical Engineering, Czech Technical University, (1998)