TY  - GEN
AU  - Kelley,Walter G.
AU  - Peterson,Allan C.
TI  - The theory of differential equations: classical and qualitative 
T2  - Universitext
SN  - 1441957820
U1  - 515.35 
PY  - 2010///
CY  - [S.l.]
PB  - Springer
ER  -