Unknotting is in AM cup co-AM. - Masao Hara; Seiichi Tani; Makoto Yamamoto (SODA, 2005)

Fast algorithms for computing Jones polynomials of certain links. - Masahiko Murakami; Masao Hara; Makoto Yamamoto; Seiichi Tani (Theor. Comput. Sci., 2007)

The determinants of certain matrices arising from the Boolean lattice. - Masao Hara; Junzo Watanabe (Discret. Math., 2008)

Mathematical characterizations and computational complexity of anti-slide puzzles. - Ko Minamisawa; Ryuhei Uehara; Masao Hara (Theor. Comput. Sci., 2023)