00306nam a2200109Ia 450000500170000000800410001708200150005810000170007324500500009026000480014030000080018820260225051101.0260224s9999||||xx |||||||||||||| ||und||  a517.38 AYR  aFrank Ayres  0aTheory and problems of differntial equations   aSingapore: McGraw-Hill Int. Book Co. c1981  a295