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[1] V. Guillemin and S. Stenberg, Geometric Asymptotics (Amer. Math Survey, Amer. Math. Soc., New York 1976).
[2] J. J. Duistermaat, Comm. Pure Appl. Math. Vol.XXVII, 207 (1974).
[3] A. Martinez, An Introduction to Semiclassical and Microlocal Analysis (SpringerVerlag, New York, 2002).
[4] Yu. A. Kravtsov and Yu. I. Orlov, Geometrical Optics of Inhomogeneous Media (SpringerVerlag, Berlin, 1990).
[5] R. G. Littlejohn and W. G. Flynn, Phys. Rev. A 44, 5239 (1991).
[6] Yu. A. Kravtsov and Yu. I. Orlov, Caustics, Catastrophes and Wave Fields (SpringerVerlag, Berlin, 1999).
[7] J. Ehlers and E. T. Newman, J. Math. Phys. 41, 3344 (2000), and references therein.
[8] J. F. Nye, Natural Focusing and Fine Structure of Light (Institute of Physics Publishing, Bristol, 1999) and references therein.
[9] V. Guillemin and S. Stenberg, Symplectic Techniques in Physics (Cambridge University Press, Cambridge, 1984).
[10] T. Stix Plasma Waves (American Institute of Physics, New York, 1992).