Subramanian, M. V., S. Jagadesan, K. Aruna, S. Pari, and S. Deivamalar. “Study on Solar Proton Events in the Sun - Induced Earth’s Magnetic Field Atmospheric Variations”. International Journal of Science and Engineering Invention, June 2017, p. 400 to 413, doi:10.23958/ijsei/vol03-i06/01.