M. Boiti et al., SOLVING THE KADOMTSEV-PETVIASHVILI EQUATION WITH INITIAL DATA NOT VANISHING AT LARGE DISTANCES, Inverse problems, 13(3), 1997, pp. 7-10
We consider, in the framework of the inverse scattering method, the so
lution of the Kadomtsev-Petviashvili equation in its version called KP
I. The spectral theory is extended to the case in which the initial da
ta u(x, y) are not vanishing along a finite number of directions at la
rge distances on the plane.