@article{PDM_2022_2_a2,
     author = {V. A. Roman'kov},
     title = {Superpositions of free {Fox} derivations},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {28--32},
     publisher = {mathdoc},
     number = {2},
     year = {2022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDM_2022_2_a2/}
}