Geodesic
Normal forms of equivariant functions
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2020), pp. 51-55

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Equivariant analogues of the Morse lemma with parameters and the theorem on the normal form of a semiquasihomogeneous function are proved. 
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     author = {I. A. Proskurnin},
     title = {Normal forms of equivariant functions},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_2020_2_a9/}
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I. A. Proskurnin. Normal forms of equivariant functions. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2020), pp. 51-55. http://geodesic.mathdoc.fr/item/VMUMM_2020_2_a9/