2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162537Some classical and quantum aspects of integrable defects are reviewed with particular emphasis on the behaviour of solitons in the sine-Gordon model.Invited talk: VII International Workshop "Lie Theory and Its Applications in Physics", Varna, 18-24 June 2007; 16 pagesHigh Energy Physics - Theorytext