00274nam a2200097Ia 4500008004100000040001100041245005200052260004900104300001300153300001000166251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aNaturebInternational Weekly Journal of Science  cOctober 1, 1996bOliver and Boyd LtdaLondon  aP. 1-530  bV. 88