Reductive Homogeneous Pseudo-Riemannian Manifolds. P.M. Gadea; J.A. Oubina — 1997 Monatshefte für Mathematik
Reflector spaces over the 4-dimensional Kaneyuki-Kozai's para-Hermitian symmetric spaces. Gadea, P.M.; Hernández Encinas, L. — 1997 Balkan Journal of Geometry and its Applications (BJGA)
Integrability of tensor structures of electromagnetic type. Hernando, J.M.; Reyes, E.; Gadea, P.M. — 1985 Publications de l'Institut Mathématique. Nouvelle Série
Homogeneous Lorentzian structures on some Gödel-Levichev's spacetimes, and associated reductive decompositions. Gadea, P.M.; Ramos, Ana Primo — 2003 Balkan Journal of Geometry and its Applications (BJGA)