Authors
Cristian Conde
Instituto de Ciencias, Universidad Nacional de Gral. Sarmiento,, Los Polvorines, Argentina
Instituto Argentino de Matemática “Alberto P. Calderón” Saavedra,, Buenos Aires, Argentina
© 2018 Cristian Conde, published by University of Silesia in Katowice, Institute of Mathematics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.