00389nam a2200133Ia 4500082002000000100001700020245006600037260003400103300002200137490007900159500000500238700000500243856000700248  a515.35bC947.DE  aCronin, Jane  aDifferential equations; introduction and qualitative theoryb  aNew YorkbMarcel Dekkerc1980  aviii, 372p. Index  aPure and Applied Mathematicsva series of monographs and textbooks ; v. 54  a  a  df