20230828104456.435585 2694-9970 pkppln Public Knowledge Project PLN 2020/2024 2024-03-28 Preserved : 4, 12 to 15, 18, 20, 22, 25, 27 to 32, 34 to 36, 38 to 44 Preserved : 4; 12; 13; 14; 15; 18; 20; 22; 25; 27; 28; 29; 30; 31; 32; 34; 35; 36; 38; 39; 40; 41; 42; 43; 44 (2) Preserved Publishing House Education and Science s.r.o. Middle European Scientific Bulletin 2694-9970 Middle European Scientific Bulletin. Middle European Scientific Bulletin Middle European Scientific Bulletin. Czech Republic https://cejsr.academicjournal.io/index.php/journal/about Middle European Scientific Bulletin