00351nam a2200109Ia 4500008004100000040001100041100002200052245008400074260006000158300001300218300001000231251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aSaunders Mac Lane 0aProceedings of the National Academy Of Sciences of the United States of America  cJuly, 1985bElsevier Science Publishers B.V.aAmsterdam  aP. 1-552  bV. 40