Geodesic
Complete sets of observables on the sphere in four-dimensional Euclidean space
Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 2, pp. 275-282 
I. Lukach. Complete sets of observables on the sphere in four-dimensional Euclidean space. Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 2, pp. 275-282. http://geodesic.mathdoc.fr/item/TMF_1977_31_2_a15/
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     title = {Complete sets of observables on the sphere in four-dimensional {Euclidean} space},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1977_31_2_a15/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Starting from the group-theoretical considerations, all possible total sets of observables on the sphere in the four-dimensional Euclidean space are found. It is shown that there are six non-equivalent total sets of observables and the most general set is connected with the elliptical coordinate system on the sphere.

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