Geodesic
Stable cohomology of complements to the discriminants of deformations of singularities of smooth functions
Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 33 (1988), pp. 3-29.

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Complements to discriminants of singularities of smooth functions are far generalizations of the classifying spaces of Artin and Brieskorn braid groups. A group of stable cohomologies (i.e., cohomologies preserved under adjacency of singularities) is described for these spaces. A relationship between these cohomologies and Gauss–Manin connectivity of singularities is indicated. A cellular realization of cohomologies of symmetric groups with coefficients in $Z_2$ is described. 
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     author = {V. A. Vassiliev},
     title = {Stable cohomology of complements to the discriminants of deformations of singularities of smooth functions},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {3--29},
     publisher = {mathdoc},
     volume = {33},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTD_1988_33_a0/}
}
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V. A. Vassiliev. Stable cohomology of complements to the discriminants of deformations of singularities of smooth functions. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 33 (1988), pp. 3-29. http://geodesic.mathdoc.fr/item/INTD_1988_33_a0/