TY  - BOOK
AU  - Pontryagin,L.S.
TI  - Ordinary differential equations
T2  - Adiwes international series in mathematics
U1  - 515.35 18
PY  - 1962///
CY  - Reading, Mass.
PB  - Addison-Wesley Pub. Co.
KW  - Differential equations
ER  -