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Luu, Do Van and Nguyen, Manh-Hung (2009) On alternative theorem and necessary optimality conditions for efficiency. Optimization, 58 (1). pp. 49-62.
Attouch, Hédy, Bolte, Jérôme, Redont, Patrick and Teboulle, Marc (2004) A Singular Riemannian Barrier Method for Constrained Minimization. Optimization, 53 (5-6). pp. 435-454.