Search for Periodicities in Galactic Cosmic Rays, Sunspots and Coronal Index before
Arrival of Relativistic Protons from the Sun

Pérez-Peraza, J.A., V.M. Velasco-Herrera, J. Zapotitla, L.I. Miroshnichenko, E.V. Vashenyuk.
Izvestiya (Bulletin) Phys. Series., RAS, 75, 6, 2011, 834-836