Geodesic
Central extensions of the Poincar\'e group
Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 422-424

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The group $\widetilde{\mathrm{Ext}}(A,\mathscr P_+^\uparrow)$ of analytical central extensions of the Poincaré group by the arbitrary connected abelian Lie group is found. 
@article{TMF_1975_22_3_a14,
     author = {V. V. Khrushchev},
     title = {Central extensions of the {Poincar\'e} group},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {422--424},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_22_3_a14/}
}
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V. V. Khrushchev. Central extensions of the Poincar\'e group. Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 422-424. http://geodesic.mathdoc.fr/item/TMF_1975_22_3_a14/