torsion
1976 / General relativity with spin and torsion: Foundations and prospects / Friedrich W. Hehl ; Paul von der Heyde ; G. David Kerlick ; James M. Nester / Reviews of Modern Physics 48 (1976) p. 393 [doi]
2002 / Physical aspects of the space–time torsion / I.L. Shapiro / Physics Reports 357 (2002) p. 113 [doi]