2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147605Global deformations of surfaces, immersed into the Euclidean 3-space, by using the modified Novikov--Veselov equation are investigated. relation to the theory of the Willmore functional is discussed20 pages , AMSTeX, all previous files were corrupted by mail (also after processing by reform-program): this is put by ftpDifferential Geometrytext