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2. G. Bertrand, “Topologie dans les images numériques”, Rapport de DEA, École Centrale des Arts et Manufactures, 1982.
3. G. Bertrand, “Simple points, topological numbers and geodesic neighborhoods in cubic grids”, Pattern Rec. Letters, Vol. 15, pp. 1003–1011, 1994.
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5. G. Bertrand, in preparation.