@article{RM_1975_30_5_a1,
     author = {V. I. Arnol'd},
     title = {Critical points of smooth functions and their normal forms},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--75},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1975_30_5_a1/}
}