Levy, P. Radiation Effects on Optical Materials. SPIE Digital Library.
Chicago-čujuhus (17. p.)Levy, Paul. Radiation Effects on Optical Materials. SPIE Digital Library.
MLA-čujuhus (9. p.)Levy, Paul. Radiation Effects on Optical Materials. SPIE Digital Library.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.