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2. Seismic Ray Theory;Červený,2001
3. An Introduction to Riemann-Finsler Geometry;Bao,2000
4. Foundations of Finsler Geometry and Special Finsler Spaces;Matsumoto,1986
5. Seismic rays as Finsler geodesics;Antonelli;Nonlinear Anal. RWA,2003