Murguialday RA, Jeremy Jeremy Hill, Bensch M, Martens SMM, Halder S, Nijboer F, Birbaumer N, et al.. Transition from the locked in to the completely locked-in state: a physiological analysis. Clin Neurophysiol [Internet]. 2011;122(5):925-33. http://www.ncbi.nlm.nih.gov/pubmed/20888292

Nijboer F, Sellers EW, Mellinger J, Jordan MA, Matuz T, Furdea A, et al.. A P300-based brain-computer interface for people with amyotrophic lateral sclerosis. Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology [Internet]. 2008;119:1909?1916. http://www.ncbi.nlm.nih.gov/pubmed/18571984