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Publicado en línea: 26 may 2018
Páginas: 44 - 53
Recibido: 30 sept 2017
Aceptado: 21 dic 2017
DOI: https://doi.org/10.2478/cait-2018-0019
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© 2018 Iliya Bouyukliev et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Bouyukliev, Iliya
Institute of Mathematics and Informatics, Bulgarian Academy of SciencesSofia, Bulgaria
Hristova, Maya
Faculty of Mathematics and Informatics, Veliko Tarnovo UniversityVeliko Tarnovo, Bulgaria