Geodesic
On group extensions connected with the Poincaré group
Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 139-141 Cet article a éte moissonné depuis la source Math-Net.Ru

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The uniqueness of group extensions by the Poincaré group is proved. An error in Michel's paper [1] is pointed out; this casts doubts on his results in the theory of central extensions of the Poincaré group. 
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Yu. M. Zinoviev. On group extensions connected with the Poincaré group. Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 139-141. http://geodesic.mathdoc.fr/item/TMF_1973_15_1_a11/

[1] L. Michel, Nucl. Phys., 57 (1964), 356 | DOI | MR | Zbl

[2] S. Eilenberg, S. Mac Lane, Ann. of Math., 48 (1947), 326 | DOI | MR | Zbl

[3] L. Michel, “Relativistic Invariance and Internal Symmetries” in Axiomatic Field Theory, New York, 1966 | MR