Inapproximability of the Edge-Contraction Problem. - Hideaki Otsuki; Tomio Hirata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Future Internet: Challenges in Virtualization and Federation. - Dae Young Kim 001; Laurent Mathy; Mauro Campanella; Rick Summerhill; James Williams 002; Shinji Shimojo; Yasuichi Kitamura; Hideaki Otsuki (AICT, 2009)

Inapproximability of the Minimum Biclique Edge Partition Problem. - Hideaki Otsuki; Tomio Hirata (IEICE Trans. Inf. Syst., 2010)

The Biclique Cover Problem and the Modified Galois Lattice. - Hideaki Otsuki; Tomio Hirata (IEICE Trans. Inf. Syst., 2015)

A New Polynomial-Time Solvable Graph Class for the Minimum Biclique Edge Cover Problem. - Hideaki Otsuki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)