no. 1
Canonical forms for separability structures with less than five Killing tensors
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 1, pp. 45-64. 
@article{AIHPA_1981__34_1_45_0,
     author = {Benenti, Sergio and Francaviglia, Mauro},
     title = {Canonical forms for separability structures with less than five {Killing} tensors},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {45--64},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {1},
     year = {1981},
     mrnumber = {605356},
     zbl = {0454.53030},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1981__34_1_45_0/}
}
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Benenti, Sergio; Francaviglia, Mauro. Canonical forms for separability structures with less than five Killing tensors. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 34 (1981) no. 1, pp. 45-64. http://www.numdam.org/item/AIHPA_1981__34_1_45_0/

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