@article{TMF_2020_204_3_a1,
     author = {V. S. Gerdjikov and A. A. Stefanov and I. D. Iliev and G. P. Boyadjiev and A. O. Smirnov and V. B. Matveev and M. V. Pavlov},
     title = {Recursion operators and hierarchies of $\text{mKdV}$ equations related to {the~Kac--Moody} algebras $D_4^{(1)}$\!, $D_4^{(2)}$\!, and $D_4^{(3)}$},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {332--354},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2020_204_3_a1/}
}