Voice-coil technology for the E-ELT M4 Adaptive Unit D. Gallieni, M. Tintori, M. Mantegazza, E. Anaclerio, L. Crimella, M. Acerboni, R. Biasi, G. Angerer, M. Andrigettoni, A. Merler et al. (19 more) Published online: 24 February 2010 DOI: 10.1051/ao4elt/201006002