The puzzle of two-photon rare earth spectra in solids
1989 ◽
pp. 29-75
◽
1984 ◽
Vol 31-32
◽
pp. 23-28
◽
Keyword(s):
Keyword(s):
2001 ◽
Vol 10
(01)
◽
pp. 113-121
◽
Keyword(s):
1962 ◽
Vol 52
(11)
◽
pp. 1307_2