00290nam a2200097Ia 4500008004100000040001100041245008000052260003500132300001600167300000900183251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings Of National Academy of Sciences of The United States Of America  c1989bPergamon PressaNew York  aP.5217-6440  bV.86