@article{01066113, title = {Four-dimensional ball-homogeneous and }, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {38}, year = {1997}, pages = {325-336}, zbl = {0884.53037}, language = {en}, url = {http://dml.mathdoc.fr/item/01066113} }
Calvaruso, G.; Tondeur, Ph.; Vanhecke, Lieven. Four-dimensional ball-homogeneous and . Beiträge zur Algebra und Geometrie, Tome 38 (1997) pp. 325-336. http://gdmltest.u-ga.fr/item/01066113/