McFarland DJ. A single g factor is not necessary to simulate positive correlations between cognitive tests. J Clin Exp Neuropsychol [Internet]. 2012;34(4):378-84. http://www.ncbi.nlm.nih.gov/pubmed/22260190

Martens SMM, Mooij JM, Jeremy Jeremy Hill, Farquhar J, Schölkopf B. A graphical model framework for decoding in the visual ERP-based BCI speller. Neural Comput [Internet]. 2011;23(1):160-82. http://www.ncbi.nlm.nih.gov/pubmed/20964540