@article{IVM_2023_6_a2,
     author = {A. A. Magazev and I. V. Shirokov},
     title = {The structure of differential invariants for a free symmetry group action},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {31--40},
     publisher = {mathdoc},
     number = {6},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2023_6_a2/}
}