... Collection¹

This is an extensive collection of mathematical recreations, especially literature describing them, organized by Richard Guy and housed in the University Library. It was based upon the extensive private collection of Eugéne Strens, hence the name. It can be consulted via the World Wide Web.

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... London²

Sources in Recreational Mathematics -- An Annotated Bibliography.

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... mirrored³

Mario Velucchi at the University of Pisa in Italy. However, Internet references are notoriously unstable.

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... site⁴

http//delta.cs.cinvestav.mx/~mcintosh

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... pats⁵

conglomerations, like pats of butter; see Oakley and Wisner's original definition [8].

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... paradigm⁶

Paradigm is an Orwellian word.

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