1. K. Bouhjar, J.J. Dijkstra, On the structure of n-point sets, Preprint
2. No n-point set is σ-compact;Bouhjar;Proc. Amer. Math. Soc.,2001
3. Tree-point sets;Bouhjar;Topology Appl.,2001
4. Generic partial two-point sets are extendable;Dijkstra;Canad. Math. Bull.,1999
5. A four-point set that cannot be split;Dijkstra;Amer. Math. Monthly,2001