P. E. Mason and J. W. Brady. "Tetrahedrality" and the Relationship between Collective Structure and Radial Distribution Functions in Liquid Water. J. Phys. Chem. B. 2007, 111 (20): 5669–5679. doi:10.1021/jp068581n.
Wiberg, Kenneth B. Inverted geometries at carbon. Acc. Chem. Res. 1984, 17 (11): 379–386. doi:10.1021/ar00107a001.
Joseph P. Kenny, Karl M. Krueger, Jonathan C. Rienstra-Kiracofe, and Henry F. Schaefer III. C5H4: Pyramidane and Its Low-Lying Isomers. J. Phys. Chem. A. 2001, 105 (32): 7745–7750. doi:10.1021/jp011642r.
Lewars E. Pyramidane: an ab initio study of the C5H4 potential energy surface. Journal of Molecular Structure: THEOCHEM. 1998, 423 (3): 173–188. doi:10.1016/S0166-1280(97)00118-8.
