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Gramlich, R., Maldeghem, H.V. Epimorphisms of Generalized Polygons Part 1: Geometrical Characterizations. Designs, Codes and Cryptography 21, 99–111 (2000). https://doi.org/10.1023/A:1008335627326
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DOI: https://doi.org/10.1023/A:1008335627326