2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79846Finite XXZ chain with double boundaries is considered at critical regime $-1<Δ<1$. We construct the eigenvectors of finite Hamiltonian by means of vertex operators and the quasi-boundary states. Using the free field realizations of the vertex operators and the quasi-boundary states, integral representations for the correlation functions are derived.LaTEX2e, 21pagesExactly Solvable and Integrable SystemsHigh Energy Physics - TheoryQuantum Algebratext