Geodesic
The punishing factors for convex pairs are $2^{n-1}$.
Revista matemática iberoamericana, Tome 23 (2007) no. 3.

Voir la notice de l'article provenant de la source Proyecto DML-E: Biblioteca Digital de Matemáticas 

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     author = {Avkhadiev, F. and  Wirths, K.J.},
     title = {The punishing factors for convex pairs are $2^{n-1}$.},
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     publisher = {mathdoc},
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     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_2007_2007_1_a32/}
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Avkhadiev, F.;  Wirths, K.J. The punishing factors for convex pairs are $2^{n-1}$.. Revista matemática iberoamericana, Tome 23 (2007) no. 3. http://geodesic.mathdoc.fr/item/RMI_2007_2007_1_a32/