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WikiPedia: Sao biến quang Cepheid http://crocus.physics.mcmaster.ca/Cepheid/HomePage... http://www.aavso.org/ http://ogle.astrouw.edu.pl/atlas/ http://www.aavso.org/ http://www.semiregular.com/ http://www.sai.msu.su/gcvs/gcvs/iii/vartype.txt http://www.popastro.com/sections/vs.htm https://web.archive.org/web/20080421150843/http://... https://ui.adsabs.harvard.edu/abs/1999AcA....49..2... https://ui.adsabs.harvard.edu/abs/2008AcA....58..1...