Heba Abdulla attya, Wafaa H. A. Zaki, and Omer sabah ibrahiem Al-Tamimi. “Statistical Analysis of Sunspot and Total Solar Irradiance Effects on the Climate in Kirkuk Area for Three Solar Cycles (22,23,24)”. Tikrit Journal of Pure Science, vol. 24, no. 5, Sept. 2019, pp. 70-75, doi:10.25130/tjps.v24i5.419.