Ishii, Yoshie, Ken Kaminishi, and Shigeyuki Haruyama. “A Study of Identifying Trends in Projector Using F-Term Codes from Japanese Patent Applications ”. International Journal of Integrated Engineering 13, no. 7 (September 27, 2021): 324–331. Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/7919.