Ekeland, Ivar Formes équivalentes d’un problème relaxe. (French) Zbl 0198.48802 C. R. Acad. Sci., Paris, Sér. A 271, 289-292 (1970). Cited in 4 Documents Keywords:control theory PDF BibTeX XML Cite \textit{I. Ekeland}, C. R. Acad. Sci., Paris, Sér. A 271, 289--292 (1970; Zbl 0198.48802)