A H215O Positron Emission Tomography Study on Mental Imagery of Movement Sequences - The Effect of Modulating Sequence Length and Direction. - Henning Boecker; Andres O. Ceballos-Baumann; Peter Bartenstein; Alain Dagher; K. Forster; Bernhard Haslinger; David J. Brooks; Markus Schwaiger; Bastian Conrad (NeuroImage, 2002)