Intersections of self-gravitating charged shells in a Reissner-Nordstrom   field
  We describe the equation of motion of two charged spherical shells with tangential pressure in the field of a central Reissner-Nordstrom (RN) source. We solve the problem of determining the motion of the two shells \textsl{after} the intersection by solving the related Einstein-Maxwell equations and by requiring a physical continuity condition on the shells velocities.   We consider also four applications: post-Newtonian and ultra-relativistic approximations, a test-shell case, and the ejection mechanism of one shell.   This work is a direct generalization of Barkov-Belinski-Bisnovati-Kogan paper. 
Marco Pizzi, Armando Paolino