Hamidi, Z.S., et al. “Application of Log Periodic Dipole Antenna (LPDA) in Monitoring Solar Burst at Low Region Frequencies Region: CALLISTO, Astronomy Astrophysics”. International Journal of Fundamental Physical Sciences, vol. 2, no. 4, Dec. 2012, pp. 72-75, doi:10.14331/ijfps.2012.330041.