Raza, Haider; Rathee, Dheeraj: 'Covariate shift detection-based nonstationary adaptation in motor-imagery-based brain–computer interface' (Control, Robotics and Sensors, 2018), 'Signal Processing and Machine Learning for Brain-Machine Interfaces', Chap. 7, pp. 125-141, DOI: 10.1049/PBCE114E_ch7
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2uk6esr9g5nol.x-iet-live-01content/books/10.1049/pbce114e_ch7