Formation of fullerene dianions in a Penning trap A. Lassesson, N. Walsh, F. Martinez, A. Herlert, G. Marx and L. Schweikhard Eur. Phys. J. D, 34 1-3 (2005) 73-77 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00122-9