Joint papers of Perles and Shelah

Perles+Shelah, A closed $(n+1)$-convex set in ${\bf R}^ 2$ is a union of $n^ 6$ convex sets -- Israel J Math 70 (1990) 305-312
Kojman+Perles+Shelah, Sets in a Euclidean space which are not a countable union of convex subsets -- Israel J Math 70 (1990) 313-342

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