00311nam a2200097Ia 4500008004100000040001100041245008400052260005200136300001600188300000900204251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings Of The National Academy Of Sciences Of The United States Of America  cMay, 1981bNational Academy Of ScienceaU. S. A  aP.2649-3980  bV.78