Perlick, V. Fermats principle, Morse theory and applications to the gravitational lens effect.
Trích dẫn kiểu ChicagoPerlick, Volker. Fermats Principle, Morse Theory and Applications to the Gravitational Lens Effect.
MLA CitationPerlick, Volker. Fermats Principle, Morse Theory and Applications to the Gravitational Lens Effect.
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