Reference Label	Details
Lembo 1990	L. J. Lembo, M. C. Bordas, and H. Helm, Phys. Rev. A 42, 6660-6669 (1990) f-Electron Rydberg Series of Triatomic Hydrogen
Helm 1988	H. Helm, Phys. Rev. A 38, 3425-3429 (1988) Measurement of the Ionization Potential of Triatomic Hydrogen