@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/