Pang J., He L.C., Zhao Z.L. «On One- and Two-Periodic Wave Solutions of the Ninth-Order KdV Equation» Математические заметки, 103, № 6, с. 943-951 (2018)

In this paper, periodic wave solutions of the ninth-order KdV equation are constructed and expressed explicitily in terms of bilinear forms obtained on the basis of a multidimensional Riemann theta-function. The dynamic futures of these solutions are discussed.