Linked from
The 44 pages that link to Stellar classification, each with the reason it gives.
SunNarrower topic: Classification places the Sun among other stars by measurable properties.
Antonia MauryNarrower topic: Maury’s system was a distinctive refinement of this broader practice.
Blue supergiantNarrower topic: Blue supergiants combine hot spectral types with luminosity class I.
SupergiantNarrower topic: Supergiant status combines spectral type with a luminosity class.
Zeta OphiuchiNarrower topic: It places Zeta Ophiuchi in the hot O spectral class.