1. [1] Y. Kuramoto, Chemical Oscillations, Waves, and Turbulence, Springer, Berlin, 1984.
2. [2] A.T. Winfree, The Geometry of Biological Time, Springer, Berlin, 1980.
3. [3] A. Pikovsky, M. Rosenblum, and J. Kurths, A universal concept in nonlinear sciences, Cambridge Univ. Press, Cambridge, 2001.
4. [4] A. Demir, A. Mehrotra, and J. Roychowdhury, IEEE Trans. Circuits Syst.-I. Fundam. Theory Applicat., vol. 47, pp. 655-674, 2000.
5. [5] H.-A. Tanaka, A. Hasegawa, H. Mizuno, and T. Endoh, IEEE Trans. Circuits Syst.-I. Fundam. Theory Applicat., vol. 49, pp. 1271-1278, 2002.