1. C. Huygens,The Pendulum Clock
(Iowa State University Press,
Ames,
1986)
2. J.W. Rayleigh, inTheory of Sound
(Dover Publishing,
New York,
1945), p. 480
3. I.I. Blekhman, inSynchronization in Science and Technology
(ASME,
New York,
1998), p. 350
4. B. Van der Pol,
Radio Rev. 1, 701
(1920)
5. J. Hertz,
A. Krogh,
R. Palmer, inIntroduction to the Theory of Neural Computation
(Addison-Wesley,
Reading, MA,
1991), p. 327