Jon Links, Huan-Qiang Zhou, Ross H McKenzie, Mark D Gould, “Algebraic Bethe ansatz method for the exact calculation of energy spectra and form factors: applications to models of Bose Einstein condensates and metallic nanograins”, J. Phys. A: Math. Gen., 36, no. 19, 2003, R63
G. Mussardo, V. Riva, G. Sotkov, “Finite-volume form factors in semi-classical approximation”, Nuclear Physics B, 670, no. 3, 2003, 464
Karol Kajetan Kozlowski, “Large-Distance and Long-Time Asymptotic Behavior of the Reduced Density Matrix in the Non-Linear Schrödinger Model”, Ann. Henri Poincaré, 16, no. 2, 2015, 437
G. Fehér, G. Takács, “Sine–Gordon form factors in finite volume”, Nuclear Physics B, 852, no. 2, 2011, 441
K. K. Kozlowski, “On form factors of the conjugated field in the nonlinear Schrödinger model”, Journal of Mathematical Physics, 52, no. 8, 2011, 083302
Balázs Pozsgay, “Local correlations in the 1D Bose gas from a scaling limit of the XXZ chain”, J. Stat. Mech., 2011, no. 11, 2011, P11017
Karol K. Kozlowski, Eric Ragoucy, “Asymptotic behaviour of two-point functions in multi-species models”, Nuclear Physics B, 906, 2016, 241