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![Cover for Volker Perlick · Ray Optics, Fermat's Principle, and Applications to General Relativity - Lecture Notes in Physics Monographs (Paperback Book) [Softcover reprint of the original 1st ed. 2000 edition] (2011)](https://imusic.b-cdn.net/images/item/original/168/9783642086168.jpg?volker-perlick-2011-ray-optics-fermat-s-principle-and-applications-to-general-relativity-lecture-notes-in-physics-monographs-paperback-book&class=scaled&v=1408469175)
![Cover for Volker Perlick · Ray Optics, Fermat's Principle, and Applications to General Relativity - Lecture Notes in Physics Monographs (Hardcover Book) [2000 edition] (2000)](https://imusic.b-cdn.net/images/item/original/985/9783540668985.jpg?volker-perlick-2000-ray-optics-fermat-s-principle-and-applications-to-general-relativity-lecture-notes-in-physics-monographs-hardcover-book&class=scaled&v=1502233188)