TY - JOUR AU - F. I. Mamedova TI - Simplest singular points of $1$-forms invariant with respect to actions of a third-order group JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 2018 SP - 60 EP - 63 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VMUMM_2018_5_a7/ LA - ru ID - VMUMM_2018_5_a7 ER -