WIMT in Gullstränd–Painlevé and Reissner–Nordström metrics: induced stable gravito-magnetic monopolesJesús Martín Romero and Mauricio BelliniEur. Phys. J. C, 75 5 (2015) 201DOI: https://doi.org/10.1140/epjc/s10052-015-3413-x