Help Notes Some publications or abstracts are available to download from our database. In order to maintain the precise format of the documents as intended by the authors themselves, the downloadable publications are in a variety of formats. [HTML]   Here the document has been converted (or is only available) in HTML (Hyper-Text Markup Language). Your web browser should have no problem displaying the document, without any other applications required.   [Abstract]   In some cases, the abstract for a publication is available. This is always in HTML format, and thus can be displayed directly by your web browser, without any other applications required.   [PDF]   PDF (Portable Document Format) is the emerging standard for publishing documents on the Web. A viewer (the Adobe Acrobat Reader) is freely available for all platforms (Windows, Unix, Macintosh) from Adobe, at www.adobe.com/prodindex/acrobat/readstep.html.   [PostScript]