V. A. Arkad'ev, A. K. Pogrebkov, M. K. Polivanov, “Application of inverse scattering method to singular solutions of nonlinear equations. I”, Theor Math Phys, 53, no. 2, 1982, 1051
L A Kalyakin, “Liouville equation under perturbation”, Inverse Problems, 17, no. 4, 2001, 879
Feza Gürsey, Chia-Hsiung Tze, “A three-dimensional model with a kink and a Higgs mechanism”, Physics Letters B, 129, no. 3-4, 1983, 205
A.K. Pogrebkov, “String solutions in three-dimensional field models”, Physics Letters B, 186, no. 3-4, 1987, 347