Oxford University Press | 1987 | ISBN: 0198532040 | english | 249p. | PDF | 9,5MBWith an appendix of Singmaster. The bible on the subject, desperatly out of print for many years.
It's possible to find it as an used book but at a very high price. Scan in 200dpi B&W except for the color plates in 300dpi colors. Despite of the two-in-one page, quite good and searchable.
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