no. 1
On relations of curvature tensors over Sen's system of affine connections
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 1, pp. 191-202. 
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     author = {Garai, Ranjan Kumar},
     title = {On relations of curvature tensors over {Sen's} system of affine connections},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {191--202},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 25},
     number = {1},
     year = {1971},
     mrnumber = {288690},
     zbl = {0211.53802},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1971_3_25_1_191_0/}
}
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Garai, Ranjan Kumar. On relations of curvature tensors over Sen's system of affine connections. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 1, pp. 191-202. http://archive.numdam.org/item/ASNSP_1971_3_25_1_191_0/

[1] Sen, H. (1959) - On relations of curvature tensors over Sen's system of affine connections. Rend. Sem. Mat. Univ. Padova. 242-255. | Numdam | MR | Zbl

[2] Sen, R.N. (1950a) - On an algebraic system generated by a single element and its application in Riemannian geometry. Bull. Cal. Math. Soc., 42 (1), 1. | MR | Zbl

[3] Sen, R.N. (1950b) - On an algebraic system etc. Bull. Cal. Math. Soc., 42 (3), 177. | MR

[4] Eisenhart, L.P. (1927) Non-Riemannian Geometry, 56. | JFM