Grannell, M. J.; Griggs, T. S. and Knor, M.
(2009).
Orientable biembeddings of Steiner triple systems of order 15.
Journal of Combinatorial Mathematics and Combinatorial Computing, 68
pp. 129–136.
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Abstract
A complete enumeration is given of orientable biembeddings involving five of the 80 Steiner triple systems of order 15. As a consequence, it follows that each of the 80 systems has a biembedding in an orientable surface, and precisely 78 of the systems have orientable self-embeddings.
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