-
I. T. Habibullin, “Sine-Gordon equation on the semi-axis”, Theoret. and Math. Phys., 114:1 (1998), 90–98
-
Adler, V, “Boundary conditions for integrable equations”, Journal of Physics A-Mathematical and General, 30:10 (1997), 3505
-
Gurel, B, “Boundary conditions for two-dimensional integrable chains”, Physics Letters A, 233:1–2 (1997), 68