Koppel, T., and M. Ahonen. “Radiofrequency Electromagnetic Fields from Mobile Devices Used for Learning and Working”. Elektronika ir Elektrotechnika 19, no. 6 (June 10, 2013): 65-70. Accessed November 21, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/4565.