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Research supported by I.W.O.N.L. grant no. 840037.
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Gevaert, H., Keppens, D. Epimorphisms of partial geometries onto generalized quadrangles. Arch. Math 53, 95–98 (1989). https://doi.org/10.1007/BF01194878
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DOI: https://doi.org/10.1007/BF01194878