00301nam a2200109Ia 4500008004100000082002400041100003200065245003200097250001200129260004200141300000800183240913s9999||||xx |||||||||||||| ||und||  aGS    004.21  GOR/E  aMarvin Gore and John Stubbe 0aElements of system analysis  a3rd ed.  bGalgotia Book SourceaNew Delhic1996  a616