TY  - GEN
AU  - Gunasinghe , E.M.
AU  - Gunasinghe , E.M. 
AU  - Jayaratne , Osmund 
TI  - Physics waves and vibrations
U1  - 531.32 
PY  - 1984///
CY  - Nugegoda
PB  - Open University
KW  - Waves and Vibrations
KW  - Physics
ER  -