Cochran, E. L.; Adrian, F. J.; Bowers, V. A. (1964). "ESR Study of Ethynyl and Vinyl Free Radicals". Journal of Chemical Physics. 40: 213. Bibcode:1964JChPh..40..213C. doi:10.1063/1.1724865.
Tucker, K. D.; Kutner, M. L.; Thaddeus, P. (1974). "The Ethynyl Radical C2H – A New Interstellar Molecule". Astrophysical Journal. 193: L115–L119. Bibcode:1974ApJ...193L.115T. doi:10.1086/181646.
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Cochran, E. L.; Adrian, F. J.; Bowers, V. A. (1964). "ESR Study of Ethynyl and Vinyl Free Radicals". Journal of Chemical Physics. 40: 213. Bibcode:1964JChPh..40..213C. doi:10.1063/1.1724865.
Tucker, K. D.; Kutner, M. L.; Thaddeus, P. (1974). "The Ethynyl Radical C2H – A New Interstellar Molecule". Astrophysical Journal. 193: L115–L119. Bibcode:1974ApJ...193L.115T. doi:10.1086/181646.