“Initial Value Problem for a Coupled System of Kadomtsev-Petviashvili II Equations in Sobolev Spaces of Negative Indices”. Pro Mathematica 22, no. 43-44 (September 7, 2008): 67–88. Accessed September 17, 2026. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10257.