00427nam a2200145Ia 4500008004100000040001700041082002400058100002100082245004400103260002800147300001300175650005900188700001500247700001900262190327s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta517.38bN424D  aNelson, Alfred L 0aDifferential equationscAlfred L Nelson  aBostonbD C Heathc1952  ax, 299p.  aDifferential equations; Differential equations, Linear  aCoral, Max  aFolley, Karl W