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WikiPedia: Ô nhiễm ánh sáng http://www.astronomy.com/news/2019/06/light-pollut... http://www.irby.com/IrbyCircuit/Vol1No2/energysavi... http://www.skyandtelescope.com/news/48814012.html http://amper.ped.muni.cz/light/lp_what_is.pdf http://www.astro.caltech.edu/palomar/community/lig... http://adsabs.harvard.edu/abs/2000MNRAS.318..641C http://adsabs.harvard.edu/abs/2011JGRD..11624106K http://adsabs.harvard.edu/abs/2014RemS....7....1K http://adsabs.harvard.edu/abs/2017SciA....3E1528K http://www.rpi.edu/dept/lrc/nystreet/