00301nam a2200121 a 450000500170000002000150001708200160003210000150004824500460006326000310010930000230014063000160016320251202164206.0  a0333181220  b515.352 COD  aCoddington  aTheory of ordinary differential equations  aNew DelhibMacmillanc1986  a429 p.c24 cm.bPB  aMathematics