R. Cominetti et Jp. Penot, TANGENT SETS TO UNILATERAL CONVEX-SETS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 321(12), 1995, pp. 1631-1636
The tangent sets of order one and two to the positive cones of some fu
nctional spaces, hence to some unilateral sets, are computed with part
icular use of methods of variational convergence.