Bard G, Hirschberg GG: Recovery of voluntary motion in upper extremity following hemiplegia. Arch Phys Med Rehabil 46: 567-572. 1965
Sunderland A, Tinson D, Bradley L, Hewer RL: Arm function after stroke: An evaluation of grip strength as a measure of recovery and a prognostic indicator. J Neurol Neurosurg Psychiatry 52: 1267-1272, 1989
Kwakkel G, Kollen BJ, van der Grond J, Prevo AJ: Probability of regaining dexterity in the flaccid upper limb: Impact of severity of paresis and time since onset in acute stroke. Stroke 34: 2181-2186, 2003