00350nam a2200133Ia 4500082001100000100002200011245002700033260005200060300001100112490006700123500001600190500000500206700000500211  aCD26b  aRitt, Joseph Fels  aDifferential algebrab  aProvidencebAmerican Mathematical Societycn.d.  aOne CD  aAmerican Mathematical Society Colloquium Publications v v. 33  aAMS Webpage  a  a