Authors
Anne Bertrand-Mathis
anne.bertrand@math.univ-poitiers.fr
Département de Mathématiques, University de Poitiers, France
anne.bertrand@math.univ-poitiers.fr
© 2020 Anne Bertrand-Mathis, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.