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Patryk Brambert
PhD, Iwona Kiniorska, PhD, Department of Mathematics and Natural Sciences, Institute of Geography, The Jan Kochanowski University in Kielce, ul. Świętokrzyska 15, 25–406Kielce, Poland
Iwona Kiniorska
Department of Mathematics and Natural Sciences, Institute of Geography, The Jan Kochanowski University in Kielce, ul. Świętokrzyska 15, 25–406Kielce, Poland