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1989ApJ...345L..51K - Astrophys. J., 345, L51-L54 (1989/October-1)
A 21 micron emission feature in four proto-planetary nebulae.
KWOK S., VOLK K.M. and HRIVNAK B.J.
Abstract (from CDS):
Abstract Copyright: ∼
Journal keyword(s): Infrared: Sources - Nebulae: Planetary - Stars: Circumstellar Shells - Stars: Evolution
Simbad objects: 5
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