J J C Nimmo, “Darboux transformations for a two-dimensional Zakharov-Shabat/AKNS spectral problem”, Inverse Problems, 8, № 2, 1992, 219
A S Fokas, L -Y Sung, “On the solvability of the N-wave, Davey-Stewartson and Kadomtsev-Petviashvili equations”, Inverse Problems, 8, № 5, 1992, 673
M. Boiti, F. Pempinelli, A. K. Pogrebkov, “Some new methods and results in the theory of (2+1)-dimensional integrable equations”, Theor Math Phys, 99, № 2, 1994, 511
S B Leble, N V Ustinov, “Third order spectral problems: reductions and Darboux transformations”, Inverse Problems, 10, № 3, 1994, 617
Shuai-Jun Liu, Xiao-Yan Tang, Sen-Yue Lou, “Multiple Darboux–Bäcklund transformations via truncated Painlevé expansion and Lie point symmetry approach”, Chinese Phys. B, 27, № 6, 2018, 060201
M. Boiti, F. Pempinelli, A. K. Pogrebkov, B. Prinari, “Towards an inverse scattering theory for two-dimensional nondecaying potentials”, Theor Math Phys, 116, № 1, 1998, 741
B Prinari, “On some nondecaying potentials and related Jost solutions for the heat conduction equation”, Inverse Problems, 16, № 3, 2000, 589
M. Boiti, F. Pempinelli, A. K. Pogrebkov, M. C. Polivanov, Nonlinear Processes in Physics, 1993, 82
B.G. Konopelchenko, W. Schief, C. Rogers, “A (2+1)-dimensional sine-Gordon system: its auto-Bäcklund transformation”, Physics Letters A, 172, № 1-2, 1992, 39
A. S. Fokas, V. E. Zakharov, “The dressing method and nonlocal Riemann-Hilbert problems”, J Nonlinear Sci, 2, № 1, 1992, 109