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Grannell, Mike and Schroeder, Justin
(2015).
URL: http://www.combinatorics.org/ojs/index.php/eljc/ar...
Abstract
It is shown that for or 3 (mod 6), every pair of Heffter difference sets modulo gives rise to a biembedding of two 2-rotational Steiner triple systems of order 2v+1 in a nonorientable surface.