Multimode electron-phonon coupling in the two-dimensional t-J–Holstein model D. Poilblanc, T. Sakai, D. J. Scalapino and W. Hanke Europhys. Lett., 34 5 (1996) 367-372 Published online: 01 September 2002 DOI: 10.1209/epl/i1996-00466-6