2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168244A method is proposed to construct a new extended KP hierarchy, which includes two types of KP equation with self-consistent sources and admits reductions to k-constrained KP hierarchy and to Gelfand-Dickey hierarchy with sources. It provides a general way to construct soliton equations with sources and their Lax representations.Published in Phys. Lett. A, 13 pagesExactly Solvable and Integrable Systemstext