1. A. V. Belov, R. T. Gushchina, L. I. Dorman, and I. V. Sirotina, “Hardness Spectrum of Long-Term Variations in Cosmic Rays,” Geomagn. Aeron. 28(4), 550–559 (1988).
2. A. V. Belov, R. T. Gushchina, L. I. Dorman, and I. V. Sirotina, Preprint No. 88(1035), IZMIRAN (Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences, 1993).
3. A. V. Belov, R. T. Gushchina, E. A. Eroshchenko, et al., “Estimation of Long-Term Stability of Detectors within the Global Network of Neutron Monitors,” Geomagn. Aeron. 47(2), 267–271 (2007) [Geomagn. Aeron. 47, 241–255 (2007)].
4. Database of the Global Network of Neutron Monitors, ftp://cr0.izmiran/rssi/ru/COSRAY!/FTP_NM/C .
5. L. I. Dorman, Meteorological Effects of Cosmic Rays (Nauka, Moscow, 1972) [in Russian].