1. Ahluwalia, H.S., Singh, P. In: Proc. of 13th ICRC, Denver, vol. 5, p. 3129, 1973.
2. Structure of the maximum phase of solar cycles 21 and 22;Bazilevskaya;Sol. Phys.,2000
3. Bieber, J.W., Evenson, P. Spaceship Earth an operational network of neutron monitors, in: Proc. of 24th ICRC, Rome, vol. 4, pp. 1316–1319, 1995.
4. Unified theory of cosmic ray diurnal variations;Bieber;Geophys. Res. Lett.,1983
5. Caballero, R., Valdes-Galicia, J.F. High altitude neutron monitor fluctuations and its relation to solar and interplanetary parameters, in: Proc. of ICRC 2001, Copernicus Gesellschaft, p. 3787, 2001.