You can export Reference Items to a text file. You can choose to include the Topic and the Notes or not.
You can specify the output folder and the character encoding (e.g. UTF-8) of the exported file under Exports and Reports Preferences.
The file is saved in the folder specified within the user preferences (see Set-up). Current date and time are used to build the file name to make it unique. The output file is opened in the text editor.