00390nam a2200133 a 450000500170000002000150001708200200003210000220005224500880007425000120016226000350017430000230020970000240023220251203091952.0  a0471089559  a515.35,bD, Boy  aBoyce, William E.  aElementary differential equations and boundary value problems, William E.Boyce, eng  a6th ed.  aNew York, John Wiley, USc1997  axvi, 749p.c24 cm.  aDiPrima, Richard C.