BIEDROŃ, Natalia; SZABAT, Marta; DĄBROWSKI, Jan; DĘBEK, Karolina; 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, [S. l.], v. 11, n. 8, p. 215–225, 2021. DOI: 10.12775/JEHS.2021.11.08.022. Disponível em: https://apcz.umk.pl/JEHS/article/view/JEHS.2021.11.08.022. Acesso em: 8 jul. 2025.