You can find all papers from the years 1996-2007 at sbornik.inforum.cz/english. This site offers also the possibility of full-text searching.
INFORUM 2007 website https://www.inforum.cz/archiv/inforum2007/en/
INFORUM 2006 website https://www.inforum.cz/archiv/inforum2006/english/index.htm