TY  - BOOK
AU  - Kelley Walter G
AU  - Peterson Allan C
TI  - Theory of differential equations: classical and qualitative
SN  - 978-1-4419-5782-5
U1  - 515.35 
PY  - 2010///
CY  - New York
PB  - Springer-Verlag
KW  - Differential equations
ER  -