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Veldkamp, F. D. Unitary groups in Hjelmslev-Moufang planes. (To appear in Math. Zeitschr.)
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Springer, T.A., Veldkamp, F.D. On Hjelmslev-Moufang planes. Math Z 107, 249–263 (1968). https://doi.org/10.1007/BF01110014
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DOI: https://doi.org/10.1007/BF01110014