Concepedia
Israel Journal of Mathematics · 1963 · 34 citations · 2 references
2
Some unsolved problems.
Paul Erdős · The Michigan Mathematical Journal · 1957 · 336 citations · Full text
Natural Sciences, Mathematics, Geometry +6
On 6-Point Configurations in 3-Space
H. T. Croft · Journal of the London Mathematical Society · 1961 · 14 citations
Natural Sciences, Mathematics, Computational Geometry +7