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- Communications in mathematics. Vol. 28, No. 3, 2020 Ostrava : University of Ostrava, 2020 . ISSN 1804-1388
- Communications in mathematics. Vol. 28, No. 2, 2020 Ostrava : University of Ostrava, 2020 . ISSN 1804-1388
- Communications in mathematics. Vol. 28, No. 1, 2020 Ostrava : University of Ostrava, 2020 . ISSN 1804-1388