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Maybe also preprint Ben Gurion University, 1997.

[19] Mikhail Klin, Christian Pech & Paul-Hermann Zieschang,
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[22] Jerod Michel,
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[23] A. Neumaier,
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[24] Oktay Olmez & Sung Y. Song,
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[25] Oktay Olmez & Sung Y. Song,
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Graphs and Combinatorics **30** (2014) 1529-1549.
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[26] Jingkun Zhou, Zhiwen He & Zhao Chai,
*Two kinds of constructions of directed stronglyregular graphs from
partial sum families and semi-direct products of groups*,
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