Geodesic
Generalized Wigner--In\"on\"u contractions and Maxwell (super)algebras
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of modern theoretical and mathematical physics: Gauge theories and superstrings, Tome 272 (2011), pp. 194-201

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We consider a class of generalized Wigner–Inönü contractions for the semidirect product of two particularly related semisimple Lie (super)algebras. A special class of such contractions provides the $D=4$ Maxwell algebra and the recently introduced simple $D=4$ Maxwell superalgebra. Further we present two types of $D=4$ $N$-extended Maxwell superalgebras, the nonstandard one for any $N$ with $\frac12N(N-1)$ central charges and the standard one, for even $N=2k$, with $k(2k-1)$ internal symmetry generators. 
@article{TM_2011_272_a16,
     author = {Jerzy Lukierski},
     title = {Generalized {Wigner--In\"on\"u} contractions and {Maxwell} (super)algebras},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {194--201},
     publisher = {mathdoc},
     volume = {272},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_272_a16/}
}
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Jerzy Lukierski. Generalized Wigner--In\"on\"u contractions and Maxwell (super)algebras. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of modern theoretical and mathematical physics: Gauge theories and superstrings, Tome 272 (2011), pp. 194-201. http://geodesic.mathdoc.fr/item/TM_2011_272_a16/