H. Henrik Ehrsson, Anders Fagergren, Tomas Jonsson, Göran Westling, Roland S. Johansson, Hans Forssberg,
Cortical activity in precision- versus power-grip tasks: an fMRI study. Journal of Neurophysiology. ,vol. 83, pp. 528- 536 ,(2000) ,
10.1152/JN.2000.83.1.528