TY  - BOOK
AU  - Hopf,Ludwig
AU  - Nef,Walter
TI  - Introduction to the differential equations of physics
T2  - [The Dover series in mathematics and physics]
AV  - QA401 .H674213 1948
PY  - 1948///
CY  - New York
PB  - Dover Publications
KW  - Differential equations
ER  -