00437    a2200157   4500001000700000003000400007005001700011008004100028082001700069100002200086245010400108250001200212260002700224300001000251700001800261066830OSt20211018105748.0                                          a515.35bB69E1 aBoyce, William E.1 aElementary differential equations and boundary value problemscby William E. Boyce and R.C. Diprima  a9th ed.  aNew DelhibWileyc2009  a796p.  aDiprima, R.C.