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BIEDROŃ, Natalia, SZABAT, Marta, DĄBROWSKI, Jan, DĘBEK, Karolina and GĄBKA, Ilona. The relationship between internet addiction and mental health problems such as depression symptoms, anxiety and insomnia before and during Covid-19 pandemic. Journal of Education, Health and Sport. Online. 19 August 2021. Vol. 11, no. 8, pp. 215-225. [Accessed 19 July 2024]. DOI 10.12775/JEHS.2021.11.08.022.