The affine $A_{n-1}^{(1)}$ Toda fields with boundary reflection

We study the affine $A_{n-1}^{(1)}$ Toda fields with boundary reflection. Our approach is based on the free field approach. We construct free field realizations of the boundary state and its dual. For an application of these realizations, we present integral representations for the form factors of the local operators. In a limiting case $\rho \to \infty$, our integral representations reproduce those of form factors for the SU(n) invariant massive Thirring model with boundary reflection [nlin.SI/0010020,Int.J.Mod.Phys.A16,no.15 (2001)2665-2689].