00317nam a2200109Ia 4500008004100000020001500041082002100056100001900077245006700096260003200163300001200195230224b        |||||||| |||| 00| 0 eng d  a0070573751  a515.35bSi592.DE  aSimmons, G. F.  aDifferential equations, with applications and historical notes  c1972aNew YorkbMcGraw-Hill  a b465p