@article{VMUMM_2018_5_a7,
     author = {F. I. Mamedova},
     title = {Simplest singular points of $1$-forms invariant with respect to actions of a third-order group},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {60--63},
     publisher = {mathdoc},
     number = {5},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2018_5_a7/}
}