%0 Journal Article %A Vladimir S. Gerdjikov %A Nikolay A. Kostov %A Tihomir I. Valchev %T $N$-Wave Equations with Orthogonal Algebras: $\mathbb Z_2$ and $\mathbb Z_2\times\mathbb Z_2$ Reductions and Soliton Solutions %J Symmetry, integrability and geometry: methods and applications %D 2007 %V 3 %U http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a38/ %G en %F SIGMA_2007_3_a38