TY  - BOOK
AU  - Kelley,Walter G.
AU  - Peterson,Allan C.
TI  - The theory of differential equations: classical and qualitative 
SN  - 0131020269
PY  - 2004///
CY  - Upper Saddle River, N.J.
PB  - Pearson Prentice Hall
KW  - Differential equations
N1  - Includes bibliographical references (p. 405-407) and index
ER  -