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S-expansions of three-dimensional real Lie algebras are considered.
Zaitsev G.A., Group-invariant study of the sets of limiting geometrie and special Lie subalgebras, 1961,
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Mubarakzyanov G.M., On solvable Lie algebras,
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Celeghini E. and Tarlini M., Contraction of group representations II,
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Couture M., Patera J., Sharp R.T. and Winternitz P., Graded contractions of
1991
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Burde D., Degenerations of 7-dimensional nilpotent Lie algebras,
2005
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Izaurieta F., Rodriguez E. and Patricio Salgado P., Expanding Lie (super)algebras through Abelian semigroups,
2006
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Nesterenko M. and Popovych R., Contractions of low-dimensional Lie algebras,
2006
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Popovych D.R. and Popovych R.O., Lowest dimensional example on non-universality of generalized Inönü–Wigner contractions,
2010
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