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@article{MAN_1976__223_162883, author = {Stephen A. Williams}, title = {A {Partial} {Solution} of the {Pompeiu} {Problem.}}, journal = {Mathematische Annalen}, pages = {183--190}, publisher = {mathdoc}, volume = {223}, year = {1976}, zbl = {0329.35045}, url = {http://geodesic.mathdoc.fr/item/MAN_1976__223_162883/} }
Stephen A. Williams. A Partial Solution of the Pompeiu Problem.. Mathematische Annalen, Tome 223 (1976), pp. 183-190. http://geodesic.mathdoc.fr/item/MAN_1976__223_162883/