2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56203Global canonical transformations to free chiral fields are constructed for DG models minimally coupled to scalar fields. The boundary terms for such canonical transformations are shown to vanish in asymptotically static coordinates if there is no scalar field.5 pages, LaTeX, Conf. Report, Dubna, July 13-17, 1998High Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext