TY  - BOOK
AU  - Gupta V.K; Gera B.L.
AU  - Gupta V.K; Gera B.L.
TI  - Elements of Modern Physics
SN  - SL0698174
U1  - C, (L8) 
KW  -  Relativistic Mechanics
KW  - emission and absorption spectra
ER  -