00295nam a2200097Ia 4500008004100000082002900041100003700070245004900107260003300156300000800189140113s9999    xx            000 0 und d  a574:001.4:578.087.1   L5  a"Clifford, H.T. & Stepheson, W."  aAn introduction to Numerical Classsification  a1975bAcademic PresscLondon  a230