Geodesic
On Generalized Douglas-Weyl Spaces
Bulletin of the Malaysian Mathematical Society, Tome 36 (2013) no. 3 Cet article a éte moissonné depuis la source Bulletin of the Malaysian Mathematical Society website

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In this paper, we show that the class of R-quadratic Finsler spaces is a proper subset of the class of generalized Douglas-Weyl spaces. Then we prove that all generalized Douglas-Weyl spaces with vanishing Landsberg curvature have vanishing the non-Riemannian quantity $\bf H$, generalizing result previously only known in the case of R-quadratic metric. Also, this yields an extension of well-known Numata's Theorem.
Classification : 53C60, 53C25 
@article{BMMS_2013_36_3_a3,
     author = {Akbar Tayebi and Hassan Sadeghi and Esmaeil Peyghan},
     title = {On {Generalized} {Douglas-Weyl} {Spaces}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_3_a3/}
}
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Akbar Tayebi; Hassan Sadeghi; Esmaeil Peyghan. On Generalized Douglas-Weyl Spaces. Bulletin of the Malaysian Mathematical Society, Tome 36 (2013) no. 3. http://geodesic.mathdoc.fr/item/BMMS_2013_36_3_a3/