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Publicado en línea: 24 ago 2018
Páginas: 313 - 318
Recibido: 18 oct 2017
Aceptado: 31 dic 2017
DOI: https://doi.org/10.1515/amsil-2017-0018
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© 2018 Katarzyna Tarchała, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Tarchała, Katarzyna
Department of Geometry, Faculty of Mathematics and Computer Science, University of Łódz, Banacha,Łódz, Poland
Walczak, Paweł
Department of Geometry, Faculty of Mathematics and Computer Science, University of Łódz, Banacha,Łódz, Poland