TY - JOUR AU - V. I. Arnol'd TI - Normal forms for functions near degenerate critical points, the Weyl groups of $A_k$, $D_k$, $E_k$ and Lagrangian singularities JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1972 SP - 3 EP - 25 VL - 6 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1972_6_4_a0/ LA - ru ID - FAA_1972_6_4_a0 ER -