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51Dxx Geometric closure systems (4 articles)

• Havel, Václav: Coordinatization of parallel systems. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 8 (1967), issue 2, pp. 199-208
• Havel, Václav: Coordinatization of parallel systems. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 7 (1966), issue 3, pp. 325-334
• Havel, Václav: Join systems and closure spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 7 (1966), issue 3, pp. 335-341
• Havel, Václav: One generalization of planar partitions of Abelian groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 7 (1966), issue 4, pp. 419-427