%0 Journal Article %A O. V. Efimovskaya %T Factorization of loop algebras over $\mathrm{so}(4)$ and integrable nonlinear differential equations %J Fundamentalʹnaâ i prikladnaâ matematika %D 2005 %P 79-94 %V 11 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FPM_2005_11_3_a4/ %G ru %F FPM_2005_11_3_a4