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„Who was Lyman Spitzer?”. NASA: For Educators. California Institute of Technology and the Jet Propulsion Laboratory. 11. 3. 2004. Архивирано из оригинала 30. 07. 2016. г. Приступљено 6. 1. 2009.
„Who was Lyman Spitzer?”. NASA: For Educators. California Institute of Technology and the Jet Propulsion Laboratory. 11. 3. 2004. Архивирано из оригинала 30. 07. 2016. г. Приступљено 6. 1. 2009.