@article{SIGMA_2007_3_a38,
     author = {Vladimir S. Gerdjikov and Nikolay A. Kostov and Tihomir I. Valchev},
     title = {$N${-Wave} {Equations} with {Orthogonal} {Algebras:} $\mathbb Z_2$ and $\mathbb Z_2\times\mathbb Z_2$ {Reductions} and {Soliton} {Solutions}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2007},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a38/}
}