First observation of superdeformed states in 191Bi M. Nyman, S. Juutinen, D. M. Cullen, I. Darby, S. Eeckhaudt, T. Grahn, P. T. Greenlees, A. Herzan, U. Jakobsson, P. Jones et al. (11 more) Eur. Phys. J. A, 51 3 (2015) 31 Published online: 23 March 2015 DOI: 10.1140/epja/i2015-15031-2