Sakanushi, T., K. Yamada, Y. Ando, T. M. Nguyen, and S. Matsuura. “A Design Method for Simple Multi-Period Repetitive Controllers for Multiple-Input/Multiple-Output Plants”. ECTI Transactions on Electrical Engineering, Electronics, and Communications, vol. 9, no. 1, July 2010, pp. 202-11, doi:10.37936/ecti-eec.201191.172482.