Introductory Slides to Refsort/Ruby

I have posted introductory slides to Refsort/Ruby in a PDF format. Please refer to them when you want to know about Refsort/Ruby. The slides also include introduction to compiled reference files of birds. A detailed user's manual in Japanese has already been included in the Refsort/Ruby package, but not one in English. Please take a look at these slides for the moment until I prepare a user's manual in English.