Styra, D., J. Gaspariūnas, and A. Usovaite. “Peculiarities of Hard Cosmic Radiation Variations Near the Ground Surface in Accordance With Geomagnetic Activity Changes”. Journal of Environmental Engineering and Landscape Management, vol. 12, no. 3, Sept. 2004, pp. 96-102, doi:10.3846/16486897.2004.9636826.