@article{RM_1968_23_4_a8,
     author = {V. I. Arnol'd},
     title = {Braids of algebraic functions and cohomologies of swallowtails},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1968},
     volume = {23},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1968_23_4_a8/}
}