On KK-compactification of 11-dimensional supergravity on a squashed 7-sphere with G₂-holonomy (M-theory on G₂-manifolds): On Kaluza-Klein compactification in supergravity: Mike Duff, Bengt Nilsson, Christopher Pope, Kaluza-Klein supergravity, Physics Reports Volume 130, Issues 1–2, January 1986, Pages 1-142 (spire:229417, doi:10.1016/0370-1573(86)90163-8) Michael Duff, Bengt Nilsson, Christopher Pope: Kaluza-Klein Supergravity 2025, in: Half a Century of Supergravity – Part II: Structure and...