@article{lemarechal-sagastizabal-1995a,
  author	= {{Lemar{\'e}chal}, C. and Sagastiz{\'a}bal, C.},
  title		= {More than first-order developments of convex functions_ primal-dual relations},
  journal	= {Journal of Convex Analysis},
  volume	= {3},
  pages		= {1--14},
  number	= {2},
  year		= {1996},
}