Reference Label	Details
Robin 1972	M. B. Robin, C. R. Brundle, N. A. Kuebler, G. B. Ellison, and K. B. Wiberg, J. Chem. Phys. 57, 1758-1763 (1972) Photoelectron Spectra of Small Rings. IV. Unsaturated Three-Membered Rings