Yerezhep, N., Trzaska, W.H., Bezrukov, L., Enqvist, T., Kuusiniemi, P., Inzhechik, L., Joutsenvaara, J., Loo, K., Lubsandorzhiev, B., Slupecki, M., Saduyev, N.O., Baktoraz, A., AND Mukhamejanov, Y.. " 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.) [Online], Volume 72 Number 1 (27 March 2020)