Sources of grey literature and their strategic potentiality in R&D area and business application.
	Richard Papik, Institute of Information Studies and Librarianship, Charles University, Prague, Czech Republic
	Information zones and "grey zone". Theoretical and practical aspects of grey literature (GL). Sources of GL contains an strategic value of use. A reflexion of the GL in electronic sources on the Internet and in commercial systems, especially produced by database vendors and electronic publishers. Basic structures and types of GL, types of grey information which is relevant for R&D processes, and also business strategies. Psychological, organizational, and other barriers of use. Future of using in Czech Republic? Practical cases.