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By: Wang, Zixing - Duobinis-Gray, Leon - White, Stephen, - Snoddy, Ed - Stuart, JamesType: ArticleIn: Transactions of the Kentucky Academy of ScienceVolume: 56Series:Issue: 1-2Date: 1995-03Page Range: 47--53Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997Subjects: