00386nam a2200133Ia 4500008004100000020001500041082001900056100001500075245007300090260004600163300000800209650001800217650001700235140316s9999    xx            000 0 und d  a818408238x  a025.04bRAT/UN  aRatzon,Lee  aUnderstanding Information Systems :What they do and why we need them  aNew DelhibIndiana Publishing Housec2009  a253  abibliometrics  acryptography