S. Pakuliak, E. Ragoucy, N. A. Slavnov, “Form factors in quantum integrable models with $GL(3)$-invariant $R$-matrix”, Nuclear Phys. B, 881 (2014), 343–368
W. Galleas, “Scalar Product of Bethe Vectors from Functional Equations”, Commun. Math. Phys., 329:1 (2014), 141
W. Galleas, J. Lamers, “Reflection algebra and functional equations”, Nuclear Physics B, 886 (2014), 1003
S. Pakuliak, E. Ragoucy, N. A. Slavnov, “Bethe vectors of quantum integrable models based on $U_q(\hat{\mathfrak{gl}}_N)$”, J. Phys. A, 47:10 (2014), 105202–16
M. Wheeler, “Multiple integral formulae for the scalar product of on-shell and off-shell Bethe vectors in -invariant models”, Nuclear Physics B, 875:1 (2013), 186