no. 3
An improvement of a result of I. N. Stewart
Compositio Mathematica, Tome 25 (1972) no. 3, pp. 329-333 
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     author = {de Ruiter, Jan},
     title = {An improvement of a result of {I.} {N.} {Stewart}},
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     year = {1972},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {25},
     number = {3},
     mrnumber = {318252},
     zbl = {0248.17008},
     language = {en},
     url = {https://www.numdam.org/item/CM_1972__25_3_329_0/}
}
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de Ruiter, Jan. An improvement of a result of I. N. Stewart. Compositio Mathematica, Tome 25 (1972) no. 3, pp. 329-333. https://www.numdam.org/item/CM_1972__25_3_329_0/

I.N. Stewart [1] Infinite-dimensional Lie algebras in the spirit of infinite group theory, Compositio Mathematica 22 (1970), pp. 313-331. [2] Lie algebras, Lecture Notes in Mathematics Vol. 127 (1970). | Zbl | MR | Numdam

P.J. Higgins [3] Lie rings satisfying the Engel condition, Proc. Camb. Phil. Soc. 50 (1954), pp. 8-15. | Zbl | MR