တောက်ပသော ဧရာမကြယ်: တည်းဖြတ်မှု မူကွဲများ

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<ref name=dick>{{cite book|title=Classifying the Cosmos: How We Can Make Sense of the Celestial Landscape|author=Steven J. Dick|page=176|publisher=Springer|isbn=9783030103804|year=2019|url=https://books.google.com/books?id=UymODwAAQBAJ}}</ref>
 
<ref name=abt>{{cite journal|bibcode=1957ApJ...126..503A|title=Line Broadening in High-Luminosity Stars. I. Bright Giants|url=https://archive.org/details/sim_astrophysical-journal_1957-11_126_3/page/503|journal=Astrophysical Journal|volume=126|pages=503|last1=Abt|first1=Helmut A.|year=1957|doi=10.1086/146423}}</ref>
 
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