共 8 条
[5]
EFFECTS OF RARE-EARTH IMPURITIES ON PHOTOCHROMIC CHARACTERISTICS OF RARE-EARTH ORTHONIOBATES
[J].
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS,
1983, 22 (11)
:1669-1674
[8]
Wigner E.P., 1959, GROUP THEORY