Origin of the Endo/Exo Stereoselectivity and Syn/Anti Face-Selectivity in Diels–Alder Reactions, Determined by Transition State Energy PartitioningKiri, Shingo; Odo, Yuka; Omar, Huda Izzat; Shimo, Tetsuro; Somekawa, Kenichi · Bulletin of the Chemical Society of Japan · 2004

Rotational barriers from semiempirical molecular orbital calculationsWilliam C. Herndon; Jerold Feuer; Lowell H. Hall · 1968