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Dillen, F., Martinez, A., Milan, F. et al. On the Pick Invariant, the Affine mean Curvature and the Gauss Curvature of Affine Surfaces. Results. Math. 20, 622–642 (1991). https://doi.org/10.1007/BF03323199
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DOI: https://doi.org/10.1007/BF03323199