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@article{MM2_1990__67_1_155495, author = {Christian Berg and Bent Fuglede}, title = {Liouville's operator for a disc in space.}, journal = {Manuscripta mathematica}, pages = {165--186}, publisher = {mathdoc}, volume = {67}, number = {1}, year = {1990}, zbl = {0702.45015}, url = {http://geodesic.mathdoc.fr/item/MM2_1990__67_1_155495/} }
Christian Berg; Bent Fuglede. Liouville's operator for a disc in space.. Manuscripta mathematica, Tome 67 (1990) no. 1, pp. 165-186. http://geodesic.mathdoc.fr/item/MM2_1990__67_1_155495/