1. The electric-furnace spectra of yttrium, zirconium, and lanthanum;King;Astrophys. J.,1927
2. Wave lengths and zeeman effects in lanthanum spectra, Bureau of Standards Journal of Research;Meggers;Research Paper 468 (RP468),1932
3. An analysis of Lanthanum spectra (LaI, La II, La III), Bureau of Standards Journal of Research;Russell;Research Paper 497 (RP497),1932
4. Energy levels of neutral praseodymium (Pr I);Zalubas;J. Opt. Soc. Am.,1973
5. Correlation effects in La, Ce, and lanthanide ions;Safronova;Phys. Rev. A: At. Mol. Opt. Phys.,2015