Photospheric activity and rotation of the planet-hosting star CoRoT-Exo-4a by Lanza, A, Aigrain, S, Messina, S, Leto, G, Pagano, I, Auvergne, M, Baglin, A, Barge, P, Bonomo, A, Cameron, A, Cutispoto, G, Deleuil, M, Medeiros, J, Foing, B, Moutou, C