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Proc Natl Acad Sci U S A. 1924 Jun;10(6):253-6.
Oort JH.
Yale University Observatory, New Haven.
PMID: 16586937 [PubMed]
PMCID: 1085634
Proc Natl Acad Sci U S A. 1978 Oct; 75(10):4640-4641.
[Proc Natl Acad Sci U S A. 1978]
Science. 1971 Sep 17; 173(4002):1087-1092.
[Science. 1971]
Appl Opt. 2006 Apr 20; 45(12):2749-54.
[Appl Opt. 2006]
Astrobiology. 2007 Feb; 7(1):85-166.
[Astrobiology. 2007]
Astrobiology. 2007 Feb; 7(1):30-65.
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