1. Boken, V. K., A. P. Cracknell, and R. H. Heathcote, 2005: Monitoring and predicting agricultural drought: A global study. Oxford University Press, New York, 472 pp.
2. Byun, H. R., and D. A. Whilhite, 1999: Objective quantification of drought severity and duration. J. Climate., 12, 2747–2756.
3. Byun, H. R., and D. K. Lee, 2002: Defining three rainy seasons and the hydrological summer monsoon in Korea using available water resources index. J. Meteor. Soc. Japan, 80, 33–44.
4. Byun, H. R., S. J. Lee, S. Morid, K. S. Choi, S. M. Lee, and D. W. Kim, 2008: Study on the periodicities of droughts in Korea. Asia-Pac. J. Atmos. Sci., 44, 417–441.
5. Chang, H. Y., and S. J. Oh, 2012: Does correction factor vary with solar cycle?. J. Astron. Space Sci., 29, 97–101.