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WikiPedia: Galaksi pilin http://www.sciamdigital.com/index.cfm?fa=Products.... http://www.sixtysymbols.com/videos/spiral_galaxies... http://spiralzoom.com/Science/spiralgalaxies/Spira... http://burro.cwru.edu/Academics/Astr222/Galaxies/S... http://adsabs.harvard.edu/abs/1940BHarO.914....9P http://adsabs.harvard.edu/abs/1957AJ.....62...69D http://adsabs.harvard.edu/abs/1970ApJ...160..811F http://adsabs.harvard.edu/abs/1980ApJ...236..351D http://adsabs.harvard.edu/abs/1994PhRvD..50.2406G http://adsabs.harvard.edu/abs/1996A&AS..120C.315C