@inproceedings{MartensFHS2009, title = {Graphical models for decoding in BCI visual speller systems}, author = {Martens, S. and Farquhar, J. and Hill, J. and Sch{\"o}lkopf, B.}, pages = {470-473}, publisher = {IEEE}, year = {2009}, doi = {10.1109/NER.2009.5109335} }