1. Auslender et Dang Tran Dac: Méthodes de descente en analyse convexe. Cahiers du Centre de Recherche Opération-nelle de Bruxelles, 3, 1976, 269–307.
2. Convergence conditions of a minimization method of almost differentiable functions;Bazhenov;Cybernetics,1972
3. Non differentiable optimization via approximation;Bertsekas;Mathematical Programming Study,1975
4. On the inverse function theorem;Clarke;Pacific Journal of Mathematics,1976
5. Generalized gradients and applications;Clarke;Transaction of the American Mathematical Society,1975