Strata in the deformation of real isolated singularities are in general non contractible
Compositio Mathematica, Volume 40 (1980) no. 3, p. 315-317
@article{CM_1980__40_3_315_0,
     author = {Acquistapace, Francesca and Broglia, F. and Lazzeri, Fulvio},
     title = {Strata in the deformation of real isolated singularities are in general non contractible},
     journal = {Compositio Mathematica},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {40},
     number = {3},
     year = {1980},
     pages = {315-317},
     zbl = {0433.14001},
     mrnumber = {571053},
     language = {en},
     url = {http://www.numdam.org/item/CM_1980__40_3_315_0}
}
Acquistapace, F.; Broglia, F.; Lazzeri, F. Strata in the deformation of real isolated singularities are in general non contractible. Compositio Mathematica, Volume 40 (1980) no. 3, pp. 315-317. http://www.numdam.org/item/CM_1980__40_3_315_0/

[1] E. Brieskorn: Sur les groupes de tresses. Sém. Bourbaky 401, Nov. 1971. | Numdam | Zbl 0277.55003

[2] P. Deligne: Les immeubles des groupes de tresses généralisés. Inventiones Math. 17 (1972) 273-302. | MR 422673 | Zbl 0238.20034

[3] F. Lazzeri: "Sistemi de coniugi" (Preprint of Math. Inst. University of Pisa (1979) to appear in Boll. Un. Mat. Ital).

[4] E. Looijenga: "The discriminant of a real simple singularity " Compositio Math. 37 (1978) 51-62. | Numdam | MR 501918 | Zbl 0407.14001

[5] Proceedings of Symposia in Pure Mathematics, vol. XXVIII (1976): "Problems of present day mathematics". | Zbl 0326.00002