Geodesic
A generalization of the Ricci identity for a function of a field of arbitrary type given in a space of affine connectedness
Matematičeskie zametki, Tome 5 (1969) no. 4, pp. 409-411.

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For a function of a field of arbitrary type given in a space of affine connectedness a relationship is deduced which is analogous to the well-known Ricci identity for tensor fields. 
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     author = {Ya. M. Chikvashvili},
     title = {A generalization of the {Ricci} identity for a function of a field of arbitrary type given in a space of affine connectedness},
     journal = {Matemati\v{c}eskie zametki},
     pages = {409--411},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_4_a1/}
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Ya. M. Chikvashvili. A generalization of the Ricci identity for a function of a field of arbitrary type given in a space of affine connectedness. Matematičeskie zametki, Tome 5 (1969) no. 4, pp. 409-411. http://geodesic.mathdoc.fr/item/MZM_1969_5_4_a1/