@article{MZM_1986_39_3_a15,
     author = {S. I. Adian and N. N. Repin},
     title = {Exponential lower estimate of the degree of nilpotency of {Engel} {Lie} algebras},
     journal = {Matemati\v{c}eskie zametki},
     pages = {444--452},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_3_a15/}
}