author={Donald Howard Menzel},
  journal={Publications of the Astronomical Society of the Pacific},
  pages={334 - 334}
  • D. Menzel
  • Published 1 October 1931
  • Physics
  • Publications of the Astronomical Society of the Pacific
Milne has recently investigated the question of transmission of radiation through a spherical-shell planetary nebula in monochromatic radiative equilibrium, i.e., through a nebula wherein any absorption process is strictly balanced by its inverse, so that energy of any given wave-length is strictly conserved. In this case, the total radiation emergent from the shell is equal to that incident on the inner surface. The nebulous material acts simply to scatter fhe light from the nuclear star, and… 
The dark secrets of gaseous nebulae -- highlights from deep spectroscopy
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Recent progress in solar physics
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X-Ray Spectroscopy in the Microcalorimeter Era. III. Line Formation under Case A, Case B, Case C, and Case D in H- and He-like Iron for a Photoionized Cloud
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