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1991BAAS...23..972J - Bull. American Astron. Soc., 23, 972-973 (1991)
Testing the planetary nebula extragalactic distance method across Hubble types in NGC 891 (Sb) and NGC 1023 (SB0).
JACOBY G., GIARDULLO R. and HARRIS W.
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Simbad objects: 3
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