Exact solution of a t-J chain with impurity
NUCLEAR PHYSICS B 489:3 (1997) 697-736
Quasi-one-dimensional spin-1/2 Heisenberg magnets in their ordered phase: Correlation functions
PHYSICAL REVIEW B 56:17 (1997) 11001-11013
X-ray edge singularity in integrable lattice models of correlated electrons
PHYSICAL REVIEW B 56:11 (1997) 6631-6641