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52A35 Helly-type theorems and geometric transversal theory (3 articles)

• Breen, Marilyn: Sets Expressible as Unions of Staircase $n$-Convex Polygons. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 50 (2011), issue 1, pp. 23-28
• Veselý, Libor: A simple geometrie proof of a theorem for starshaped unions of convex sets. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 49 (2008), issue 2, pp. 79-82
• Duchet, Pierre: Convexity in combinatorial structures. (English). In: Frolík, Z., Souček, V. and Fabián, M. (eds.): Proceedings of the 14th Winter School on Abstract Analysis. Circolo Matematico di Palermo, Palermo, 1987. pp. [261]-293