by Benz, Ela N., Hornby, T.George, Bode, Rita K., Scheidt, Robert A., Schmit, Brian D.
Published in Archives of physical medicine and rehabilitation (2005)

by McDonagh, Jennifer C., Gorman, Robert B., Gilliam, Edwin E., Hornby, T.George, Reinking, Robert M., Stuart, Douglas G.
Published in Journal of physiology, Paris (1999)