Abstract
Continuously differentiable ovals in compact disconnected Pappian planes are characterized by their finite homomorphic images.
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Tillmann, J. Ovale in p-adischen Ebenen. Geom Dedicata 39, 233–251 (1991). https://doi.org/10.1007/BF00182297
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DOI: https://doi.org/10.1007/BF00182297