@article{RM_1985_40_3_a9,
     author = {R. I. Bogdanov},
     title = {Invariants of elementary singular points in a~plane},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {227--228},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1985_40_3_a9/}
}