@article{01142952, title = {Remarks on the smoothness of the }, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {54}, year = {1997}, pages = {381-391}, zbl = {0896.35102}, language = {en}, url = {http://dml.mathdoc.fr/item/01142952} }
Beirão da Veiga, H. Remarks on the smoothness of the . Portugaliae Mathematica. Nova Série, Tome 54 (1997) pp. 381-391. http://gdmltest.u-ga.fr/item/01142952/