... C haos theory, c omplex systems, fractals, secure communication by chaos, nonlinear economical problems, theory of billiards, fibrillation in the cardiac tissue, prediction problem of nonlinear processes. ... Dynamical Chaos and Applications . Billiards . Controlling chaotic systems and Supression of chaos . Time series analysis . ... Bifurcation theory . Modelling cardiac arrhythmias . ...