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Graham Higman's lectures on januarials
Martson Conder and Timothy Riley
The Quarterly Journal of Mathematics (Oxford), 65 (1), pages 113–131, 2014
This account, part historical and part original, is based on a series of lectures of Graham Higman on januarials,
namely coset graphs for actions of triangle groups which become 2-face maps
when embedded in orientable surfaces.
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