Lemarechal, C. <https://pure.iiasa.ac.at/view/iiasa/2110.html>  (2006).  Optimisation non Differentiable: Methodes de Faisceaux.    In:  Computing Methods in Applied Sciences and Engineering, 1977, I. Eds. Glowinski, R., Lions, J.L., & Liboria, I., pp. 53-61 Germany: Springer Berlin Heidelberg.  ISBN 978-3-540-35411-6 10.1007/BFb0063614 <https://doi.org/10.1007/BFb0063614>.