Foliations and separation of variables
Structure transverse des feuilletages, Astérisque no. 116  (1984), p. 214-221
@incollection{AST_1984__116__214_0,
     author = {Sacksteder, Richard},
     title = {Foliations and separation of variables},
     booktitle = {Structure transverse des feuilletages},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {116},
     year = {1984},
     pages = {214-221},
     zbl = {0553.58037},
     mrnumber = {755172},
     language = {en},
     url = {http://www.numdam.org/item/AST_1984__116__214_0}
}
Sacksteder, Richard. Foliations and separation of variables, in Structure transverse des feuilletages, Astérisque, no. 116 (1984), pp. 214-221. http://www.numdam.org/item/AST_1984__116__214_0/

[1] Tom H. Koornwinder, Review of reference 3 below. Bulletin of the American Mathematical Society, New. Series, vol. 1 (1979), pp. 1014-1019. | MR 1567202

[2] Tom H. Koornwinder, "A precise definition of separation of variables", In Geometrical approaches to differential equations, Lecture Notes in Mathematics, vol. 810 (1980), pp. 240-263. | Article | MR 589212 | Zbl 0459.35005

[3] Willard Miller Jr. , Symmetry and Separation of variables, Addison-Wesley Publishing Company, (1977). | MR 460751 | Zbl 0368.35002

[4] P. M. Morse and H. Feshbach, Methods of theoretical physics, Mc Graw-Hill, (1953). | MR 59774 | Zbl 0051.40603