@article{IM2_1975_9_2_a4,
     author = {A. N. Varchenko},
     title = {A theorem on topological versal deformation},
     journal = {Izvestiya. Mathematics},
     pages = {277--296},
     year = {1975},
     volume = {9},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_2_a4/}
}