Y. Zhang, D. Guo, F. Li, E. Yin, Y. Zhang, P. Li, Q. Zhao, T. Tanaka, D. Yao, and P. Xu,“Correlated component analysis for enhancing the performance of SSVEP-based brain-computer interface,” IEEE Trans. Neural Systems and Rehabilitation Eng., vol. 26, no. 5, pp. 948-956, May 2018.