TY  - BOOK
AU  - Lawden, Derek F.
TI  - Mathematics of engineering systems: (linear and non-linear) 
U1  - 517.38 
PY  - 1959///
CY  - London, New York
PB  - Methuen, Wiley
KW  - Differential equations
KW  - Fourier series
N1  - Includes bibliographical references
ER  -