YEREZHEP, N. et al. Underground investigation of extensive air showers spectra at high energy range of cosmic rays and other research in the Pyhäsalmi mine. Recent Contributions to Physics (Rec.Contr.Phys.), [S.l.], v. 72, n. 1, p. 19-26, mar. 2020. ISSN 2663-2276. Available at: <https://bph.kaznu.kz/index.php/zhuzhu/article/view/1245>. Date accessed: 11 july 2020. doi: https://doi.org/10.26577/RCPh.2020.v72.i1.03.