@article{01693767, title = {Sharp }, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {58}, year = {2001}, pages = {77-120}, zbl = {1008.35039}, language = {en}, url = {http://dml.mathdoc.fr/item/01693767} }
Goatin, P.; LeFloch, P.G. Sharp . Portugaliae Mathematica. Nova Série, Tome 58 (2001) pp. 77-120. http://gdmltest.u-ga.fr/item/01693767/