00285nam a2200109Ia 4500008004100000082001500041100001500056245006100071260002500132300001000157650000800167060110s9999    xx            000 0 und d  a515bSAX/F  aSAXENA, HC  aFinite differences and numerical analysiscBy H C Saxena  bS Chand and Coc1988  a358p.  a515