Geodesic
On group extensions connected with the Poincar\'e group
Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 139-141

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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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     author = {Yu. M. Zinoviev},
     title = {On group extensions connected with the {Poincar\'e} group},
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Yu. M. Zinoviev. On group extensions connected with the Poincar\'e group. Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 139-141. http://geodesic.mathdoc.fr/item/TMF_1973_15_1_a11/