[1] P.L. Antonelli, R. Ingarden and M. Matsumoto, The Theory of Sprays and Finsler Spaces with Applications in Physics and Biology, Kluwer Academic Publishers, 1993.
[2] D. Bao, S. S. Chern and Z. Shen, An Introduction to Riemann-Finsler Geometry, Springer-Verlage, 2000.
[3] L. Berwald, Ä Uber Parallel Äubertragung in Raumen mit allgemeiner Massbestimmung, Jber. Deutsch. Math.-Verein., 34(1926), 213-220.
[4] E. Cartan, Les espaces de Finsler, Hermann Paris, 1934.
[5] B. Li and Z. Shen, Ricci curvature tensor and non-Riemannian quantities, Canad. Math. Bull. 58(2015), 530-537.
[6] M. Matsumoto, A theory of three-dimensional Finsler spaces in terms of scalars, Demonst. Math, 6(1973), 223-251.
[7] M. Matsumoto, Remarks on Berwald and Landsberg spaces, Contemporary Math. 196(1996), 79-81.
[8] M. Matsumoto, On C-reducible Finsler spaces, Tensor, N.S. 24(1972), 29-37.
[9] M. Matsumoto, An improvement proof of Numata and Shibata's theorem on Finsler spaces of scalar curvature, Publ. Math. Debrecen. 64(2004), 489-500.
[10] M. Matsumoto and S. Ho ̅jo ̅, A conclusive theorem for C-reducible Finsler spaces, Tensor, N.S. 32(1978), 225-230.
[11] X. Mo, Z. Shen and H. Liu, A new quantity in Riemann-Finsler geometry, Glasgow Math. J. 54(2012), 637-645.
[12] B. Najafi, Z. Shen and A. Tayebi, Finsler metrics of scalar flag curvature with special non-Riemannian curvature properties, Geometriae Dedicata, 131(2008), 87-97.
[13] B. Najafi and A. Tayebi, Weakly stretch Finsler metrics, Publ Math Debrecen, 91(2017), 441-454.
[14] Z. Shen, On some non-Riemannian quantities in Finsler geometry, Canad. Math. Bull. 56(2013), 184-193.
[15] Z. Shen, On R-quadratic Finsler spaces, Publ. Math. Debrecen. 58(2001), 263-274.
[16] Z. I. Szabo ́, Positive definite Berwald spaces (Structure theorems on Berwald spaces),
Tensor (N.S.), 35(1981), 25-39.
[17] Z. I. Szabo ́, Berwald metrics constructed by Chevalley's polynomials, Preprint arXiv:math.DG/0601522 (2006).
[18] A. Tayebi and H. Sadeghi, On Cartan torsion of Finsler metrics, Publ. Math. Debrecen. 82(2) (2013), 461-471.
[19] A. Tayebi and T. Tabatabaeifar, Douglas-Randers manifolds with vanishing stretch tensor, Publ. Math. Debrecen. 86(2015), 423-432.