Jaschek, Mercedes; Jaschek, Carlos; Arnal, Marcelo. Helium-Weak Stars. Publications of the Astronomical Society of the Pacific. October 1969, 81 (482): 651. Bibcode:1969PASP...81..650J. doi:10.1086/128832.
Alonso, M. S.; López-García, Z.; Malaroda, S.; Leone, F. Elemental abundance studies of CP stars. The helium-weak stars HD 19400, HD 34797 and HD 35456*. Astronomy and Astrophysics. April 2003, 402: 331. Bibcode:2003A&A...402..331A. doi:10.1051/0004-6361:20030222.
Jaschek, Mercedes; Jaschek, Carlos; Arnal, Marcelo. Helium-Weak Stars. Publications of the Astronomical Society of the Pacific. October 1969, 81 (482): 651. Bibcode:1969PASP...81..650J. doi:10.1086/128832.
Alonso, M. S.; López-García, Z.; Malaroda, S.; Leone, F. Elemental abundance studies of CP stars. The helium-weak stars HD 19400, HD 34797 and HD 35456*. Astronomy and Astrophysics. April 2003, 402: 331. Bibcode:2003A&A...402..331A. doi:10.1051/0004-6361:20030222.