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The variability of 3C 390.3 (1980)
Journal Article
Barr, P., Pollard, G., Sanford, P., Ives, J., Ward, M., Hine, R., …Lloyd, C. (1980). The variability of 3C 390.3. Monthly Notices of the Royal Astronomical Society, 193, 549-562

A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418. (1980)
Journal Article
Clavel, J., & Flower, D. (1980). A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418. Monthly Notices of the Royal Astronomical Society, 190(1), 1P-4P. https://doi.org/10.1093/mnras/190.1.1p

The continuous emission of IC 418 has been observed at high dispersion with the IUE satellite and the spectrum searched for the A1Π−X1Σ+A1Π−X1Σ+ bands of CO. It was not possible to unequivocally detect these CO bands in IC418. However, an upper limit... Read More about A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418..