(1)
Yerezhep, N.; Trzaska, W.; Bezrukov, L.; Enqvist, T.; Kuusiniemi, P.; Inzhechik, L.; Joutsenvaara, J.; Loo, K.; Lubsandorzhiev, B.; Slupecki, M.; Saduyev, N.; Baktoraz, A.; Mukhamejanov, Y. Underground Investigation of Extensive Air Showers Spectra at High Energy Range of Cosmic Rays and Other Research in the Pyhäsalmi Mine. Rec.Contr.Phys. 2020, 2020, 19-26.