Weak coupling many-polaron description of ultracold bosonic impurities in a condensate W. Casteels, J. Tempere and J.T. Devreese Eur. Phys. J. Special Topics, 217 (2013) 163-167 Published online: 11 March 2013 DOI: 10.1140/epjst/e2013-01764-x