Fabian H L Eßler, Holger Frahm, Alexander R Its, Vladimir E Korepin, “Determinant representation for a quantum correlation function of the lattice sine - Gordon model”, J. Phys. A: Math. Gen., 30:1 (1997), 219
Н. М. Боголюбов, “Термодинамика одномерного решеточного бозе-газа”, ТМФ, 67:3 (1986), 451–462; N. M. Bogolyubov, “Thermodynamics of a one-dimensional lattice Bose gas”, Theoret. and Math. Phys., 67:3 (1986), 614–622
A. N. Kirillov, N. Yu. Reshetikhin, “Exact solution of the Heisenberg XXZ model of spin s”, J Math Sci, 35:4 (1986), 2627