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Characterizations of the sphere by means of visual cones: an alternative proof of Matsuura's theorem. E. Morales Amaya (expositor) and D. J. Verdusco Hernández. Helly and Tverberg type Theorems. Oaxaca , Oaxaca. Octubre 2019.
open.library.ubc.ca/cIRcle/collections/48630/items/1.0389769
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