00462nam a22001337a 450000500170000000800410001702000180005804100080007608200190008410000230010324501420012626000460026830000140031420260420091451.0260420b        |||||||| |||| 00| 0 eng d  a0-06-041913-X  aeng  a515.352bETG/A  aEtgen, Garrest J.   aA Introduction to Ordinary Differential Equations bwith difference equations numerical methods and applications c/ by Garrest J. Etgen   aNew York bHarper& Row, Publishers c1977  ax, 517p.