no. 1
The discriminant of a real simple singularity
Compositio Mathematica, Tome 37 (1978) no. 1, pp. 51-62 
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     author = {Looijenga, Eduard},
     title = {The discriminant of a real simple singularity},
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     pages = {51--62},
     year = {1978},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {37},
     number = {1},
     mrnumber = {501918},
     zbl = {0407.14001},
     language = {en},
     url = {https://www.numdam.org/item/CM_1978__37_1_51_0/}
}
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Looijenga, Eduard. The discriminant of a real simple singularity. Compositio Mathematica, Tome 37 (1978) no. 1, pp. 51-62. https://www.numdam.org/item/CM_1978__37_1_51_0/

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