Gauge formulation for higher order gravity R.R. Cuzinatto, C.A.M. de Melo, L.G. Medeiros and P.J. Pompeia Eur. Phys. J. C, 53 1 (2008) 99-108 Published online: 01 November 2007 DOI: 10.1140/epjc/s10052-007-0441-1