00269nam a2200109Ia 4500008004100000022001400041040001100055245001100066260005800077300001300135300001100148251112s9999||||xx |||||||||||||| ||und||  a0028-0836  aCNCLSA 0aNature  cNovember 4-10, 1982bMacmillan Journals LtdaNew York  aP. 1-786  bV. 300