2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36258We shall use the variational decomposition technique in order to calculate equations of motion and Noether energy-momentum complex for some classes of non-linear gravitational Lagrangians within the first-order (Palatini) formalism. In particular, a complex space-time appears as a solution of our variational problem.9 pages in LaTeX (sprocl.sty). Extended version; misprints removed, comments and references added. To appear in Proc. Int. Sem. Math. Cosmol., Potsdam, 1998, M. Rainer and H.-J. Schmidt (eds.), WSPC SingaporeGeneral Relativity and Quantum Cosmologytext