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These results form parts of the author’s doctoral dissertation that has been prepared under the supervision of Prof. Dr. H. Lenz at the Freie Universität Berlin.
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Jungnickel, D. On difference matrices and regular latin squares. Abh.Math.Semin.Univ.Hambg. 50, 219–231 (1980). https://doi.org/10.1007/BF02941430
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DOI: https://doi.org/10.1007/BF02941430