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© 1956 American Institute of Physics.
1956
American Institute of Physics
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L. H. Aller, C. C. Kiess; Gaseous Nebulae: Vol. 3 of the International Astrophysics Series. Physics Today 1 December 1956; 9 (12): 29–30. https://doi.org/10.1063/1.3059848
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