1. Bertil Hille, Ion Channels of Excitable Membranes, Third Edition, Sinauer, Sunderland, 2001.
2. Hille, 351–354.
3. O. S. Andersen, Ann. Rev. Physiol. 46:531–548, 1984.
4. R. P. Feynman, The Feynman Lectures on Physics II, Addison-Wesley, 1964, 1–9.
5. The physical basis of selectivity is reviewed in J. M. Diamond and E. M. Wright, Ann. Rev. Physiol. 31:581–646, 1969.