TY  - BOOK
AU  - Zill, DG.
TI  - A first course in differential equations
SN  - 0-87150-319-0
AV  - QA372.Z54 
PY  - 1982///
CY  - Boston
PB  - Prindle, Weber & Schmidt
KW  - Differential equations
N1  - Includes index
ER  -