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For me the article by B. N. Cooperstein is behind a paywall. But I think the object you are looking for is the Hoffman–Singleton graph. There is a wikipedia page about that graph., see

https://en.wikipedia.org/wiki/Hoffman%E2%80%93Singleton_graph

For me the article by B. N. Cooperstein is behind a paywall. But I think the object you are looking for is the Hoffman–Singleton graph. There is a wikipedia page about that graph.

For me the article by B. N. Cooperstein is behind a paywall. But I think the object you are looking for is the Hoffman–Singleton graph. There is a wikipedia page about that graph, see

https://en.wikipedia.org/wiki/Hoffman%E2%80%93Singleton_graph

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For me the article by B. N. Cooperstein is behind a paywall. But I think the object you are looking for is the Hoffman–Singleton graph. There is a wikipedia page about that graph.