00279nam a2200097Ia 4500008004100000040001100041245005100052260005300103300001600156300000900172251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceeding of the national academy of sciences  cJune, 1984bNational Academy Of ScienceaU. S. A  aP.3607-4616  bV.81