PLANCK-LFI scientific goals: Implications for the reionization history

Popa, La; Burigana, C; Mandolesi, N; Butler, Rc; Cuttaia, F; Finelli, F; Franceschi, E; Galaverni, M; Gruppuso, A; Malaspina, M; Morgante, G; Paci, F; Procopio, P; Sandri, M; Stringhetti, L; Terenzi, Luca; Valenziano, L; Villa, F; Zuccarelli, J.