1. V.M. Babich, M.A. Lyalinov, V.E. Grikurov, The Sommerfeld
Sommerfeld
-Malyuzhinets Technique in Diffraction Theory (Alpha Science International, Oxford, 2007)
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3. E.T. Copson, Asymptotic Expansions (Cambridge University Press, Cambridge, 1965)
4. R. Courant, D. Hilbert, Methods of Mathematical Physics, vol. I (Interscience Publishers, New York, 1953); vol. II, (Interscience Publishers, New York, 1962)
5. P. Drude, The Theory of Optics (Dover, New York, 1959)