00287nam a2200109Ia 4500082002000000100001900020245004900039260005100088300002800139500000500167700000500172  a515.35bP656.OD  aPinney, Edmund  aOrdinary difference-differential equationsb  aBerkeleybUniversity of California Pressc1958  axii, 262p. Index, Bibl.  a  a