The HARPS search for southern extra-solar planets - XXXII. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone
G. Lo Curto, M. Mayor, W. Benz, F. Bouchy, G. Hébrard, C. Lovis, C. Moutou, D. Naef, F. Pepe, D. Queloz, N. C. Santos, D. Segransan and S. Udry
