Bidelman, William P. The Spectra of Certain Stars whose Atmospheres may BE Deficient in Hydrogen. Astrophysical Journal. 1953, 117: 25. Bibcode:1953ApJ...117...25B. doi:10.1086/145665.
Skuljan, L.; Cottrell, P. L. Recent declines of RS Telescopii, UW Centauri, and V Coronae Australis. The Observatory. 2002, 122: 322–29. Bibcode:2002Obs...122..322S.
Bidelman, William P. The Spectra of Certain Stars whose Atmospheres may BE Deficient in Hydrogen. Astrophysical Journal. 1953, 117: 25. Bibcode:1953ApJ...117...25B. doi:10.1086/145665.