Estimation of Intracranial P300 Speller Sites with Magnetoencephalography (MEG) - Perspectives for Non-invasive Navigation of Subdural Grid Implantation. - Milena Korostenskaja; Christoph Kapeller; P. C. Chen; Robert Prueckl; Rupert Ortner; Ki H. Lee; T. Kleineschay; Christoph Guger; James Baumgartner 001; E. M. Castillo (Brain-Computer Interface Research (5), 2017)