Brunner P, Bianchi L, Guger C, Cincotti F, Schalk G. Current Trends in Hardware and Software for Brain-Computer Interfaces (BCIs). J Neural Eng [Internet]. 2011;8(2):025001. http://www.ncbi.nlm.nih.gov/pubmed/21436536

Schalk G. Effective brain-computer interfacing using BCI2000. Conf Proc IEEE Eng Med Biol Soc. 2009. pp. 5498-501. 

Schalk G, McFarland DJ, Hinterberger T, Birbaumer N, Wolpaw J. BCI2000: a general-purpose brain-computer interface (BCI) system. IEEE Trans Biomed Eng. 2004;51(6):1034-43.