Intersegmental phase lags in the lamprey spinal cord: Experimental confirmation of the existence of a boundary region. - Thelma L. Williams; Karen A. Sigvardt (J. Comput. Neurosci., 1994)

Tremor. - Leonid L. Rubchinsky; Alexey S. Kuznetsov; Vicki L. Wheelock; Karen A. Sigvardt (Scholarpedia, 2007)