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Bennett, G. K.; Grannell, M. J. and Griggs, T. S.
(2004).
URL: http://www.emis.de/journals/AMUC/_vol-73/_no_1/_be...
Abstract
It is shown that each possible pair of the 80 isomorphism classes of Steiner triple systems of order 15 may be realized as the colour classes of a face 2-colourable triangulation of the complete graph in a non-orientable surface. This supports the conjecture that every pair of STS()s,
, can be biembedded in a non-orientable surface.