@article{FAA_1972_6_4_a0,
     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/}
}