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Edelstein and Kelly theorem states the following.

Let $A$, $B$ and $C$ be $3$ nonempty finite subsets of points in $\mathbb{R}^n$ such that affine-span $(A \cup B \cup C)$ has dimension at least $4$ and $A \cap B \cap C$ is empty. Then there exists a line intersecting exactly $2$ of the sets $A$, $B$, $C$.

Where can I find a proof of this theorem? I can not find the corresponding paper

[ M. Edelstein and L. M. Kelly. Bisecants of finite collections of sets in linear spaces. Canadanian Journal of Mathematics, 18:375–380, 1966 ].

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Thank to Victor: cms.math.ca/openaccess/cjm/v18/cjm1966v18.0375-0380.pdf

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