© 2020 MarKjoe Olunna Uba, Karol Mikula, Zuzana Krivá, Hanh Nguyen, Thierry Savy, Eléna Kardash, Nadine Peyríeras, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.