1. E. C. Stakman and J. G. Harrar, “Principles of Plant Pathology,” The Ronald Press Co., New York, 1957, p.392.
2. The following library of crystallographic programs was used: SHELXS-86, G. M. Sheldrick, University of Göttingen, Göttingen, West Germany (1986); ORTEP-II, C. K. Johnson, Oak Ridge National Laboratory, Oak Ridge, Tennessee (1970); SDP Plus V1.1, Y. Okaya and B. A. Frenz, B. A. Frenz and Associates, College Station, Texas (1984).
3. H. G. Cutler, Proc. 11th Annual Meeting, Plant Growth, Regulator Society of America, ed. by A. R. Cooke, 1984, p. 1~9.