H. I. Abdussamatov, “Long-term variations of the integral radiation flux and possible temperature changes in the solar core,” Kinematics and Physics of Celestial Bodies, Vol. 21, No. 6, pp. 328–332, 2005.
 H. I. Abdussamatov, “The time of the end of the current solar cycle and the relationship between duration of 11-year cycles and secular cycle phase,” Kinematics and Physics of Celestial Bodies, Vol. 22, pp. 141–143, 2006.
 H. I. Abdussamatov, “Optimal prediction of the peak of the next 11-year activity cycle and of the peaks of several succeeding cycles on the basis of long-term variations in the solar radius or solar constant,” Kinematics and Physics of Celestial Bodies, Vol. 23, pp. 97–100, 2007.
 C. Fr?hlich, “Solar constant,” 2009. http://www.pmodwrc. ch/pmod.php?topic=tsi/composite/SolarConstant
 SIDC (Solar Influences Data Analysis Center), 2009. http://sidc.oma.be/sunspot-data/