00369nam a2200121Ia 4500008004100000022001400041040001100055100002300066245008400089260005000173300001400223300001000237251112s9999||||xx |||||||||||||| ||und||  a0027-8424  aCNCLSA  aFrances R. Zwanzig 0aProceedings of the National Academy Of Sciences of the United States of America  c1991bThe National Academy of SciencesaU.S.A  aP. 1-1084  bV. 89