OPTICAL ABSORPTION OF SEMICONDUCTING AND METALLIC SmS AND Sm1-xLnxS FILMS R. SURYANARAYANAN, I.A. SMIRNOV, G. BRUN et S.G. SHUL'MAN J. Phys. Colloques, 37 C4 (1976) C4-271-C4-274 DOI: 10.1051/jphyscol:1976447