1. Andronov, A.A., Vitt, A.A., Khaikin, S.E.: Theory of Oscillations. Pergamon Press, Oxford (1966)
2. Binet, J.P.M.: Mémoire sur un systéme de fomules analytiques, et le$$\breve{u}$$r application à des considérations géometriques. J. École Polytech. 9 Cahier 16, 280–302 (1812)
3. Boichenko, V.A., Leonov, G.A.: Lorenz equations in dynamics of nematic liquid crystals. Dep. in VINITI 25.08.86, 6076–V86, Leningrad (1986). (Russian)
4. Boichenko, V.A., Leonov, G.A.: On orbital Lyapunov exponents of autonomous systems. Vestn. Leningrad Gos. Univ. Ser. 1, 3, 7–10 (1988) (Russian, English transl. Vestn. Leningrad Univ. Math., 21(3), 1–6, 1988)
5. Boichenko, V.A., Leonov, G.A.: Lyapunov functions, Lozinskii norms, and the Hausdorff measure in the qualitative theory of differential equations. Am. Math. Soc. Transl. 2(193), 1–26 (1999)