@article{GDZPPN002230747, title = {Liouville's operator for a disc in space.}, journal = {Manuscripta mathematica}, volume = {67}, year = {1990}, pages = {165-186}, zbl = {0702.45015}, url = {http://dml.mathdoc.fr/item/GDZPPN002230747} }
Berg, Christian; Fuglede, Bent. Liouville's operator for a disc in space.. Manuscripta mathematica, Tome 67 (1990) pp. 165-186. http://gdmltest.u-ga.fr/item/GDZPPN002230747/