On the nature of lithium-rich giant stars - Constraints from beryllium abundances C. H. F. Melo, P. de Laverny, N. C. Santos, G. Israelian, S. Randich, J. D. do Nascimento Jr and J. R. De Medeiros A&A, 439 1 (2005) 227-235 Published online: 22 July 2005 DOI: 10.1051/0004-6361:20041805