M. Tajiri et Y. Murakami, LATTICE SOLITON - SOLUTIONS TO THE KADOMTSEV-PETVIASHVILI EQUATION WITH POSITIVE DISPERSION, Journal of mathematical physics, 34(6), 1993, pp. 2400-2411
Lattice soliton solutions that have doubly periodic array of the local
ized structures in the plane are presented to the Kadomtsev-Petviashvi
li equation with the positive dispersion by using the superposition of
the rational functions. Each structure is similar to the rational sol
iton. The existence condition and some properties are also presented.