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)
Breaking of resonance and regularizing effect of a first order quasi-linear term in some elliptic equations Boumediene Abdellaoui; Ireneo Peral; Ana Primo — 2008 Annales de l'I.H.P. Analyse non linéaire