@article{SIGMA_2006_2_a13,
     author = {Faruk G\"ung\"or},
     title = {On the {Virasoro} {Structure} of {Symmetry} {Algebras} of {Nonlinear} {Partial} {Differential} {Equations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2006},
     volume = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2006_2_a13/}
}