00282nam a2200121Ia 4500082002300000100002100023245004900044250000900093260003400102300001400136500000500150700000500155  a658.40388bL274.TA  aLangefors, Borje  aTheoretical analysis of information systemb  a2nd.  aLundbStudentlitteraturc1967  aiv, 400p.  a  a