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Invent. Math. 146:1 (2001), 93-141.

"Surgery on Lagrangian and Legendrian Singularities."
Geom. and Funct. Analysis, 9:2 (1999), 298-352.

"On the necessity of Legendrian fold singularities."
Internat. Math. Res. Notices 20 (1998), 1055-1077.