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1970ApJ...162..495C - Astrophys. J., 162, 495-505 (1970)
Spectrophotometric studies of gaseous nebulae. XVII. Three planetary nebulae with marked stratification effects: NGC 6309, NGC 7026, and IC 1747.
CZYZAK S.J. and ALLER L.H.
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Simbad objects: 3
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