N. Ikeda et Ki. Izawa, GAUGE-THEORY BASED ON QUADRATIC LIE-ALGEBRAS AND 2D GRAVITY WITH DYNAMIC TORSION, Progress of theoretical physics, 89(5), 1993, pp. 1077-1085
We construct a two-dimensional field theory with gauge symmetry based
on quadratically nonlinear extension of Lie algebras. The case of Lore
ntz-covariant quadratic extension of the Poincare algebra turns out to
give the Yang-Mills-like formulation of R2 gravity with dynamical tor
sion.