TY  - GEN
AU  - Jayasinghe , E.M.
AU  - Jayarathne , Osmund
TI  - Physics: waves and vibrations block 2-A
U1  - 531.33 
PY  - 1984///
CY  - Nawala
PB  - Open University
KW  - Waves
KW  - Vibrations
KW  - Physics
ER  -