Additive symmetric: the non-negative case
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(2) Laboratoire de l’Informatique du Parallélisme. SPI. École Normale Supérieure de Lyon Unité Mixte de Recherche CNRS-INRIA-ENS LYON no 5668.
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(6) Ó . École Normale Supérieure de Lyon 46 Allée d’Italie, 69364 Lyon Cedex 07, France Téléphone : +33(0)4.72.72.80.37 Télécopieur : +33(0)4.72.72.80.80 Adresse électronique :
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