J. Armstrong, and J. van Hemert. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 367 (1896):
2387 --2397(June 2009)
J. White, E. Southgate, J. Thomson, and S. Brenner. Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 314 (1165):
1--340(November 1986)PMID: 22462104.