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6The Data Archive, University of Essex. An investigation into the digital preservation needs of universities and research funders:the future of unpublished research materials, http://www. ukoln. ac. uk/services/papers/bl/blril09/datrep, html(2005-07-30).
7D. Hazen,et. al. Selecting research collections for digitization, http://eprints, ucl. ac. uk/archive/00000492/01/paul_ayris3, pdf(2005-07-30).
8Paul Ayris. Guidance for Selecting Materials for Digitisation. http://www. rig. org/preserv/joint/ayris. html(2005-07-30).
9Katherine M. Wisser . Guidelines for Digitization. http ://www. ncecho. org/Guide/toc. htm(2005-07-30).
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