00307nam a2200097Ia 4500008004100000040001100041245008400052260004700136300001700183300000900200251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings of the National Academy Of Sciences of the United States of America  cApril, 1989bProc. Natl. Acad. Sci.aU.S.A  aP. 2521-3928  bV.84