TY - JOUR AU - Faruk Güngör TI - On the Virasoro Structure of Symmetry Algebras of Nonlinear Partial Differential Equations JO - Symmetry, integrability and geometry: methods and applications PY - 2006 VL - 2 UR - http://geodesic.mathdoc.fr/item/SIGMA_2006_2_a13/ LA - en ID - SIGMA_2006_2_a13 ER -