TY  - BOOK
AU  - Williams EW
AU  -  Hall R
TI  - Luminescence and the light emitting diode: The basics and technoloy of leds and the luminescienc properties of the materials
T2  - Pergamon international library of science , technology, engineering and social studies; 13
U1  - C5:73, L8 
PY  - 1978///
CY  - Oxford
PB  - Pergamon Press        
KW  - Radiations
ER  -