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Available at: &lt;<a href="http://www.pes.pwsz.pila.pl/index.php/PES/article/view/15" target="_new">http://www.pes.pwsz.pila.pl/index.php/PES/article/view/15</a>&gt;. Date accessed: 19 aug. 2025.
doi: <a href="https://doi.org/10.14595/PIES/01/009">https://doi.org/10.14595/PIES/01/009</a>.