Johansson S et al. Eta Carinae And Other Mysterious Stars: The Hidden Opportunities Of Emission Line Spectroscopy (Eds T R Gull, S Johansson, K Davidson) (San Francisco, Calif.: Astron. Soc. of the Pacific, 2001) p. 297
Gull T R et al. Eta Carinae And Other Mysterious Stars: The Hidden Opportunities Of Emission Line Spectroscopy (Eds T R Gull, S Johansson, K Davidson) (San Francisco, Calif.: Astron. Soc. of the Pacific, 2001) p. 391
Letokhov V S Zh. Eksp. Teor. Fiz.53 1442 (1967)
Letokhov V S Amazing Light: A Volume Dedicated To Charles Hard Townes On His 80th Birthday (Ed. R Y Chiao) (Berlin: Springer, 1996) p. 409