• E. Horita and Y. Miyanaga, “Numerically stable RLS algorithms for time-varying signals,” Wiley Online Library, Electron. Commun. Jpn., Pt.3, Volume 82, Issue 4, pp.26-37, Apr. 1999. Translated from IEICE Trans. Fundamentals, vol.J81-A, no.1, pp.33-43, Jan. 1998.
• E. Horita, K. Sumiya, H. Urakami, and S. Mitsuishi, “A Leaky RLS Algorithm: Its Optimality and Implementation,” IEEE Transactions on Signal Processing, vol.52, no.10, pp.2924-2932, October 2004.
• E. Horita, “A fast algorithm for time-varying regularization parameter updates in an LRLS filter,” IEICE Trans. Fundamentals, vol.J99-A, no.10, pp.399-407, Oct. 2016. In Japanese.
• E. Horita, “A Computationally Efficient Leaky and Regularized RLS Filter for Its Short Length,” IEICE Trans on Fundamentals, vol.E100-A, no.12, pp.3045-3048, Dec. 2017.

E. Horita, “Adaptive filters based on the method of least-squares,” the section 3-2 of digital signal processing in Knowledge Base of IEICE, in Japanese.

• IEEE Senior Member on 23rd November 2013.
• IEICE Senior Member on 19th May 2015.