Wigner lattice of ripplopolarons in a multielectron bubble in helium J. Tempere, S. N. Klimin, I. F. Silvera and J. T. Devreese Eur. Phys. J. B, 32 3 (2003) 329-338 Published online: 11 April 2003 DOI: 10.1140/epjb/e2003-00106-7