@article{test,
 author = {A. I. Shirshov},
 journal = {Mat. Sbornik N. S.},
 volume = {33},
 number = {75},
 issue = {2},
 pages = {441--452},
 title = {Subalgebras of free Lie algebras (Russian)},
 year = {1953},
 mrnumber = {MR0059892}
}