1. Arnold, V.I.: Contact geometry: the geometrical method of Gibbs’s Thermodynamics. In: Proceedings of the Gibbs Symposium, Yale University, pp. 163–179 (1989)
2. Barros, M., Romero, A.: Indefinite Kaehler manifolds. Math. Ann. 261, 55–62 (1982)
3. Beem, J.K., Ehrlich, P.E.: Global Lorentzian Geometry, 1st edn. Marcel Dekker, Inc., New York (1981) (Second Edition (with Easley, K. L.), 1996)
4. Bejancu, A.: Geometry of CR-Submanifolds. D. Reidel, Dordrecht (1986)
5. Berger, M.: Riemannian Geometry During the Second Half of the Twentieth Century. Lecture Series, vol. 17. American Mathematical Society, Providence (2000)