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reference. Degenerate spin groups as semi-direct products [dereli2010degenerate]

@article{dereli2010degenerate,
 title = {Degenerate spin groups as semi-direct products},
 author = {Dereli, Tekin and Ko{\c{c}}ak, {\c{S}}ahin and Limoncu, Murat},
 year = {2010},
 journal = {Advances in applied Clifford algebras},
 volume = {20},
 number = {3},
 pages = {565--573},
 publisher = {Springer}
}