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Grannell, M. J.; Griggs, T. S. and Knor, M.
(2009).
URL: http://www.bootcampcentral.com/content.cfm?pageid=...
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.