Geodesic
Generalized Casimir elements
Izvestiya. Mathematics , Tome 27 (1986) no. 2, pp. 391-400.

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A method is given for constructing a central element in the universal enveloping algebra $\mathfrak A(L)$ of a Lie algebra $L$, generalizing the method for constructing a Casimir element and not requiring the existence of a nondegenerate invariant form on $L$. Generalized Casimir elements are constructed for certain Lie algebras of Cartan types over a field of positive characteristic. Bibliography: 15 titles. 
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A. S. Dzhumadil'daev. Generalized Casimir elements. Izvestiya. Mathematics , Tome 27 (1986) no. 2, pp. 391-400. http://geodesic.mathdoc.fr/item/IM2_1986_27_2_a8/

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