Paper has been retracted by the Editors in Chief with author’s permission.
Ars Mathematica Contemporanea, Tome 14 (2018) no. 1, pp. 15-23.

Voir la notice de l'article provenant de la source Ars Mathematica Contemporanea website

Paper has been retracted by the Editors in Chief with author’s permission.
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​ ​. Paper has been retracted by the Editors in Chief with author’s permission.. Ars Mathematica Contemporanea, Tome 14 (2018) no. 1, pp. 15-23. http://geodesic.mathdoc.fr/item/AMC_2018__14_1_a2/