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Forbes, A. D.; Griggs, T. S.; Psomas, C. and Širáň, J.
(2014).
DOI: https://doi.org/10.1017/S0017089513000220
Abstract
We prove that for all n ≡ 13 or 37 (mod 72), there exists a biembedding of a pair of Steiner triple systems of order n in an orientable pseudosurface having precisely one regular pinch point of multiplicity 2.