Paper and Keynote Lectures are presented as PDF files.

Enhance information exchange using Adobe PDF files
Adobe® Reader® is free software that allows everyone from business professionals to home users to easily and reliably view, print, and search PDF files using a variety of platforms and devices.

• Windows version (.exe - 30MB)
  
  
• Linux version (.tar.gz - 9MB)
  
  
• Others versions: http://www.adobe.com/products/acrobat/readstep2.html