00261nam a2200109Ia 4500008004100000020001000041040001100051245001100062260005600073300001200129300001000141251112s9999||||xx |||||||||||||| ||und||  c1.00  aCNCLSA 0aNature  cJanuary 3, 1972bMacmillan Journal LimitedaU. S. A  aP.1-176  bV.235