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2. P.W. Milonni, Fast Light Slow Light and Left-Handed Light (Institute of Physics, Bristol, 2005)
3. J.D. Jackson, Classical Electrodynamics (Wiley, New York, 1999)
4. L. Brillouin, Wave Propagation and Group Velocity (Academic, New York, 1960)
5. L. Brillouin, Wave Propagation in Periodic Structures (McGraw-Hill, New York, 1946)