@article{FPM_2007_13_5_a6,
     author = {A. A. Mikhalev and A. V. Mikhalev and A. A. Chepovskii and K. Champagnier},
     title = {Primitive elements of free nonassociative algebras},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {171--192},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2007_13_5_a6/}
}