TY  - GEN
AU  - Jayasinghe ,  E.M. 
AU  - Jayarathna , Osmand
TI  - Physics waves and vibrations
U1  - 531.32 
PY  - 1984///
CY  - Nugegoda
PB  - Open University
KW  - Waves and vibration
KW  - Physics
ER  -