RUTKOWSKA, Anna et al. Stress levels and mental well-being among Slovak students during e-learning in the COVID-19 pandemic. In Healthcare. - Basel : Multidisciplinary Digital Publishing Institute, 2021. ISSN 2227-9032, 2021, vol. 9, no. 10, pp. [1-11]. Available on: https://doi.org/10.3390/healthcare9101356.