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1 Introduction
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2 Wave optics in gravitational lensing
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3 Geometrical optics approximation
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4 Quasi-geometrical optics approximation
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5 Results for specific lens models
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6 Conclusions
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References
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Online Material
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Appendix A: Numerical computation of the amplification factor
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Appendix B: Asymptotic expansion of the amplification factor for
non-axially symmetric lens models
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