TY  - GEN
AU  - Annakkage ,  H.K.D.A.T.N.
AU  - Jayasingherarachchi , D.A. 
AU  - Abayadeera , D.R. 
AU  -  Kularatne , K.R. 
TI  - Physics diffraction: psy 3114
U1  - 535.42 
CY  - Nugegoda
PB  - Open University
KW  - PHYSICS
ER  -