TY  - BOOK
AU  - Pontryagin L S
AU  - Kacinskas Leonas
TI  - Ordinary differential equations
U1  - 515.352 
PY  - 1962///
CY  - London
PB  - Addison Wesley
KW  - Calculus
KW  - Differential equations
N1  - Tr from the Russian
ER  -