Investigation of abnormal absorption of cosmic-ray hadrons in lead calorimeters A.S. Borisov, V.G. Denisova, V.I. Galkin, Z.M. Guseva, E.A. Kanevskaya, M.G. Kogan, R.A. Mukhamedshin, S.I. Nazarov, V.S. Puchkov and T.Kh. Sadykov EPJ Web Conf., 208 (2019) 06001 Published online: 10 May 2019 DOI: 10.1051/epjconf/201920806001