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

Chen Y, Chen XY, Jakeman LB, Schalk G, Stokes BT, Wolpaw J. The interaction of a new motor skill and an old one: H-reflex conditioning and locomotion in rats. The Journal of neuroscience : the official journal of the Society for Neuroscience [Internet]. 2005;25:6898?6906. http://www.ncbi.nlm.nih.gov/pubmed/16033899

Blankertz B, Müller K-R, Curio G, Vaughan TM, Schalk G, Wolpaw J, et al.. The BCI Competition 2003: progress and perspectives in detection and discrimination of EEG single trials. IEEE transactions on bio-medical engineering [Internet]. 2004;51:1044?1051. http://www.ncbi.nlm.nih.gov/pubmed/15188876

Schalk G, Wolpaw J, McFarland DJ, Pfurtscheller G. EEG-based communication: presence of an error potential. Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology [Internet]. 2000;111:2138?2144. http://www.ncbi.nlm.nih.gov/pubmed/11090763