2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/80245We find necessary and sufficient conditions for an operator of the fourth order on a graph with loops to admit the (L,A,B)-triple Krichever-Novikov deformation of one energy level.2 pages in LaTeXExactly Solvable and Integrable SystemsDynamical Systemstext