@article{lemarechal-oustry-sagastizabal-2000,
  author	= {{Lemar{\'e}chal}, C. and Oustry, F. and Sagastiz{\'a}bal, C.},
  title		= {The {$\cal U$-Lagrangian} of a convex function},
  journal	= {Transactions of the AMS},
  volume	= {352},
  number	= {2},
  pages		= {711--729},
  year		= {2000},
}