Correlation analysis of solar energetic particles and secondary cosmic ray flux Nikola Veselinović, Mihailo Savić, Aleksandar Dragić, Dimitrije Maletić, Radomir Banjanac, Dejan Joković, David Knežević and Vladimir Udovičić Eur. Phys. J. D, 75 6 (2021) 173 Published online: 08 June 2021 DOI: 10.1140/epjd/s10053-021-00172-x