TY  - BOOK
AU  - Martin,William Ten
AU  - Reissner,Eric
TI  - Elementary differential equations 
U1  - 517.38 MAR R  
PY  - 1956///.
CY  - Massachusetts : 
PB  - Addison-Wesley Publishing Company, 
KW  -  Differential equations
N1  - Includes index.
ER  -