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Cabezas, C.; Tercero, B.; Agúndez, M.; 외. (2021). “Cumulene carbenes in TMC-1: Astronomical discovery of I\-H2C5”. 《Astronomy & Astrophysics》 650: L9. doi:10.1051/0004-6361/202141274. ISSN0004-6361.
McCarthy, M. C.; Travers, M. J.; Kovács, A.; 외. (1997). “Detection and Characterization of the Cumulene Carbenes H2C5 and H2C6”. 《Science》 275 (5299): 518–520. doi:10.1126/science.275.5299.518. ISSN0036-8075.