Geodesic
Normal forms for functions near degenerate critical points, the Weyl groups of $A_k$, $D_k$, $E_k$ and Lagrangian singularities
Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 4, pp. 3-25

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     author = {V. I. Arnol'd},
     title = {Normal forms for functions near degenerate critical points, the {Weyl} groups of $A_k$, $D_k$, $E_k$ and {Lagrangian} singularities},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {3--25},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_4_a0/}
}
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V. I. Arnol'd. Normal forms for functions near degenerate critical points, the Weyl groups of $A_k$, $D_k$, $E_k$ and Lagrangian singularities. Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 4, pp. 3-25. http://geodesic.mathdoc.fr/item/FAA_1972_6_4_a0/