A note on 2-step subideals of Lie algebras
Compositio Mathematica, Tome 27 (1973) no. 3, pp. 273-275. 
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     zbl = {0276.17005},
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     url = {http://www.numdam.org/item/CM_1973__27_3_273_0/}
}
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Stewart, Ian. A note on 2-step subideals of Lie algebras. Compositio Mathematica, Tome 27 (1973) no. 3, pp. 273-275. http://www.numdam.org/item/CM_1973__27_3_273_0/

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