Application of real zero concept to coherent detector for quadrature amplitude modulation. - Hiroki Ishibashi; Hiroshi Suzuki; Kazuhiko Fukawa; Satoshi Suyama (PIMRC, 2010)

Approximate State Abstraction for Markov Games. - Hiroki Ishibashi; Kenshi Abe; Atsushi Iwasaki (AAAI, 2025)