no. 2
Canonical forms for 𝒮 n-3 -structures in pseudo-riemannian manifolds
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 30 (1979) no. 2, pp. 143-157 
@article{AIHPA_1979__30_2_143_0,
     author = {Benenti, Sergio and Francaviglia, Mauro},
     title = {Canonical forms for $\mathcal {S}_{n-3}$-structures in pseudo-riemannian manifolds},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {143--157},
     publisher = {Gauthier-Villars},
     volume = {30},
     number = {2},
     year = {1979},
     mrnumber = {535370},
     zbl = {0459.53019},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1979__30_2_143_0/}
}
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Benenti, Sergio; Francaviglia, Mauro. Canonical forms for $\mathcal {S}_{n-3}$-structures in pseudo-riemannian manifolds. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Volume 30 (1979) no. 2, pp. 143-157. https://www.numdam.org/item/AIHPA_1979__30_2_143_0/

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