A plus type CC-based current-mode universal biquadratic circuit. - Takao Tsukutani; Noboru Yabuki; Kazuharu Hashitsume (ISPACS, 2019)

Novel positive current output DVCC-based biquadratic circuit. - Takao Tsukutani; Noboru Yabuki; Kazuharu Hashitsume (ISPACS, 2021)

Toward Writing Skill Acquisition Support System for People with Dysgraphia: Evaluation of Alphabet Writing Dexterity in Healthy Early Twenties. - Tomohiko Igasaki; Naoki Itasaka; Kazuharu Hashitsume (BioCAS, 2022)

Handwriting Difficulties: A Review of Recent Advances in the Identification and Intervention. - Suatmi Murnani; Kazuharu Hashitsume; Tomohiko Igasaki (IEEE Access, 2025)