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@article{IM_1987__90_143503, author = {L Luengo}, title = {The ?-constant stratum is not smooth.}, journal = {Inventiones mathematicae}, pages = {139--152}, publisher = {mathdoc}, volume = {90}, year = {1987}, zbl = {0627.32018}, url = {http://geodesic.mathdoc.fr/item/IM_1987__90_143503/} }
L Luengo. The ?-constant stratum is not smooth.. Inventiones mathematicae, Tome 90 (1987), pp. 139-152. http://geodesic.mathdoc.fr/item/IM_1987__90_143503/