Foliations and separation of variables
Structure transverse des feuilletages, Astérisque, no. 116 (1984), pp. 214-221. 
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     title = {Foliations and separation of variables},
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     pages = {214--221},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {116},
     year = {1984},
     mrnumber = {755172},
     zbl = {0553.58037},
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     url = {http://archive.numdam.org/item/AST_1984__116__214_0/}
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Sacksteder, Richard. Foliations and separation of variables, dans Structure transverse des feuilletages, Astérisque, no. 116 (1984), pp. 214-221. http://archive.numdam.org/item/AST_1984__116__214_0/

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[3] Willard Miller Jr. , Symmetry and Separation of variables, Addison-Wesley Publishing Company, (1977). | MR | Zbl

[4] P. M. Morse and H. Feshbach, Methods of theoretical physics, Mc Graw-Hill, (1953). | MR | Zbl