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Froda-Schechter, Micheline Quasi-systèmes de fermeture. (French) Zbl 0385.06004 Math., Rev. Anal. Numér. Théor. Approximation, Math. 19(42), 211-215 (1977). MSC: 06A15 08A05 PDF BibTeX XML Cite \textit{M. Froda-Schechter}, Math. Rev. Anal. Numér. Théor. Approximation, Math. 19(42), 211--215 (1977; Zbl 0385.06004) OpenURL