A1 - Werla, Marcin PB - PSNC L1 - http://lib.psnc.pl/Content/250/Part+9.pdf L2 - http://lib.psnc.pl/Content/250 ER - T1 - Why to evaluate accessibility and usability of digital libraries? UR - http://lib.psnc.pl/dlibra/docmetadata?id=250