van Dijk J P, Stegeman D F, Zwarts M J, Blok J H
Donders Institute for Brain, Cognition and Behaviour, 920 - Department of Neurology/Clinical Neurophysiology, Radboud University Nijmegen Medical Center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
Suppl Clin Neurophysiol. 2009;60:105-18. doi: 10.1016/s1567-424x(08)00010-x.