Geodesic
Cyclic bi-embeddings of Steiner triple systems on 31 points
Glasgow mathematical journal, Tome 43 (2001) no. 1, pp. 145-151

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We investigate cyclic bi-embeddings in an orientable surface of Steiner triple systems on 31 points. Up to isomorphism, we show that there are precisely 2408 such embeddings. The relationship of these to solutions of Heffter's first difference problem is discussed and a procedure described which, under certain conditions, transforms one bi-embedding to another. 
Bennett, G. K.; Grannell, M. J.; Griggs, T. S. Cyclic bi-embeddings of Steiner triple systems on 31 points. Glasgow mathematical journal, Tome 43 (2001) no. 1, pp. 145-151. doi: 10.1017/S001708950101014X
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     title = {Cyclic bi-embeddings of {Steiner} triple systems on 31 points},
     journal = {Glasgow mathematical journal},
     pages = {145--151},
     year = {2001},
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     doi = {10.1017/S001708950101014X},
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