EXCITON LINES IN RARE-EARTH ORTHOCHROMITES S. SUGANO, Y. UESAKA, I. TSUJIKAWA, K. AOYAGI et K. TSUSHIMA J. Phys. Colloques, 32 C1 (1971) C1-798-C1-800 DOI: 10.1051/jphyscol:19711281
