Chemistry - 1969 Whitten, J. L., & Hackmeyer, M. (1969). Configuration Interaction Studies of Ground and Excited States of Polyatomic Molecules. I. The CI Formulation and Studies of Formaldehyde. The Journal of Chemical Physics, 51(12), 5584–5596. https://doi.org/10.1063/1.1671985 Petke, J. D., Whitten, J. L., & Douglas, A. W. (1969). Gaussian Lobe Function Expansions of Hartree–Fock Solutions for the Second‐Row Atoms. The Journal of Chemical Physics, 51(1), 256–262. https://doi.org/10.1063/1.1671716 Petke, J. D., & Whitten, J. L. (1969). Ab Initio Studies of Orbital Hybridization in Polyatomic Molecules. The Journal of Chemical Physics, 51(8), 3166–3174. https://doi.org/10.1063/1.1672490