Published in
American Astronomical Society, Astrophysical Journal, 2(704), p. L108-L112, 2009
DOI: 10.1088/0004-637x/704/2/l108
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MOLECULAR SURVIVAL IN EVOLVED PLANETARY NEBULAE: DETECTION OF H 2 CO, C-C 3 H 2 , AND C 2 H IN THE HELIX
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