Thirty four Comparisons are Required to Sort 13 Items. - Takumi Kasai; Shusaku Sawato; Shigeki Iwata (Logic, Language and Computation, 1994)

Robust audio watermark method using sinusoid patterns based on pseudo-random sequences. - Zheng Liu; Yoshiyuki Kobayashi; Shusaku Sawato; Akira Inoue (Security and Watermarking of Multimedia Contents, 2003)