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@article{MAN_1987__277_164271, author = {Qi-Ming Wang}, title = {Isoparametric {Functions} on {Riemannian} {Manifolds.} {I.}}, journal = {Mathematische Annalen}, pages = {639--646}, publisher = {mathdoc}, volume = {277}, year = {1987}, zbl = {0638.53053}, url = {http://geodesic.mathdoc.fr/item/MAN_1987__277_164271/} }
Qi-Ming Wang. Isoparametric Functions on Riemannian Manifolds. I.. Mathematische Annalen, Tome 277 (1987), pp. 639-646. http://geodesic.mathdoc.fr/item/MAN_1987__277_164271/