1. Alexander, G., R. N. Keshavamurty, U. S. De, R.Chellappa, S. K. Das and P. V. Pillai, 1978:Fluctuations of monsoon activity. Indian J. Met.Hydrol. Geophys., 29, 76-87.
2. Anderssen, E. C., 1965: A study of atmospheric longwaves in the Southern Hemisphere. Notos, 14,30-38.
3. Cadet, D. and P. Olory-Togbe, 1977: The propagation of tropical disturbances over the Indian oceanduring the summer monsoon. Mon. Wea. Rev.,105, 700-708.
4. Chang, T, and C. Wang, 1976: A preliminary analy-sis about large-scale circulation of tropical areaand its mid-range variation in summer season.Proc. Conf. Tropical Weather, 1-9 (in Chinese).
5. Chang, T, and T. Yasunari, 1981: (To be published.)