00291nam a2200097Ia 4500008004100000040001100041245008000052260003500132300001700167300000900184251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings Of National Academy of Sciences of The United States Of America  c1990bPergamon PressaNew York  aP.9073-10241  bV.87