On the normalisation of the observed spectral gain line profile with increasing optical thickness of a substance layer
1976 ◽
Vol 6
(3)
◽
pp. 359-361
◽
1994 ◽
Vol 144
◽
pp. 365-367
2006 ◽
Vol 2006
(suppl_23_2006)
◽
pp. 129-134
◽
2009 ◽
Vol 60
◽
pp. 7-16
◽