00307nam a2200097Ia 4500008004100000040001100041245008400052260004600136300001700182300001000199251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings of the National Academy Of Sciences of the United States of America  cJuly, 1988bProc. Natl. Acad. Sci.aU.S.A  aP. 4945-6226  bV. 85