1. L.W. Williams, The Anatomy of the Common Squid, Loligo Pealii (Leseur), Leiden, 1909; John Z. Young, Cold Spring Harbor Symposia on Quantitative Biology 4: 1–6, 1936.
2. Michael R. Guevara, in Nonlinear Dynamics in Physiology and Medicine, edited by Anne Beuter, Leon Glass, Michael C. Mackey and Michèle S. Titcombe, 2003, 87–121. With kind permission of Springer Science and Business Media.
3. Kenneth S. Cole, Membranes, Ions, and Impulses, University of California, Berkeley, 1972, 145–148.
4. Reprinted from Ichiji Tasaki, Physiology and Electrochemistry of Nerve Fibers, Academic Press, New York, 1982, 37–64, by permission from Elsevier.
5. John A. Connor, in Molluscan Nerve Cells: From Biophysics to Behavior, edited by John Koester and John H. Byrne, Cold Spring Harbor Laboratory, 1980, 125–133.w