About this article
Published Online: Apr 18, 2020
Page range: 136 - 139
DOI: https://doi.org/10.2478/asn-2020-0013
Keywords
© 2020 Dragomir Marchev et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Marchev, Dragomir
University of Shumen, Faculty of Natural Sciences, Department of Physics and AstronomyShumen, Bulgaria
Dimitrov, Georgi
University of Shumen, Faculty of Mathematics and Informatics, Department of Computer InformaticsShumen, Bulgaria
Pavlova, Nataliya
University of Shumen, Faculty of Mathematics and Informatics, Department of Computer InformaticsShumen, Bulgaria
Vasileva, Doroteq
University of Shumen, Faculty of Natural Sciences, Department of Physics and AstronomyShumen, Bulgaria
Borisov, Borislav
University of Shumen, Faculty of Natural Sciences, Department of Physics and AstronomyShumen, Bulgaria
Atanasova, Teodora
University of Shumen, Faculty of Natural Sciences, Department of Physics and AstronomyShumen, Bulgaria
Marchev, Vladislav
Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of SciencesSofia, Bulgaria