Anisotropic spin-orbit induced splitting of intersubband spin plasmons F. Baboux, F. Perez, C. A. Ullrich, I. D’Amico, J. Gómez and M. Bernard EPJ Web of Conferences, 40 (2013) 18002 Published online: 14 January 2013 DOI: 10.1051/epjconf/20134018002