The embedding method beyond the single-channel case - Two-mode and Hubbard chainsA. Freyn, G. Vasseur, P. Schmitteckert, D. Weinmann, G.-L. Ingold, R. A. Jalabert and J.-L. PichardEur. Phys. J. B, 75 2 (2010) 253-266DOI: https://doi.org/10.1140/epjb/e2010-00153-y