Author(s): Teiji Kunihiro
-- hep-ph/0009116 was replaced with a revised version
on Sat, 21 Oct 2000 09:06:16 GMT (28kb) --
Paper: hep-ph/0009116
Comments: Typos are corrected. Some of statements are moved to footnotes
URL: http://arXiv.org/abs/hep-ph/0009116