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Pin oxide bạc P-3 Orion Pin Oak, Quận Madison, IllinoisTài liệu tham khảo
WikiPedia: Pi3_Orionis http://www.astro.utoronto.ca/~garrison/mkstds.html http://www.solstation.com/stars/pi3ori2.htm http://cdsarc.u-strasbg.fr/viz-bin/Cat?J/ApJS/168/... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi0... http://vizier.u-strasbg.fr/viz-bin/Cat?cat=V/130& http://www.lcsd.gov.hk/CE/Museum/Space/Research/St... //arxiv.org/abs/0708.1752 //arxiv.org/abs/0806.2878 //arxiv.org/abs/0811.3982