no. 3
A characterization of quasi-homogeneous Gorenstein surface singularities
Compositio Mathematica, Tome 55 (1985) no. 3, pp. 269-288 
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     author = {Wahl, Jonathan M.},
     title = {A characterization of quasi-homogeneous {Gorenstein} surface singularities},
     journal = {Compositio Mathematica},
     pages = {269--288},
     year = {1985},
     publisher = {Martinus Nijhoff Publishers},
     volume = {55},
     number = {3},
     mrnumber = {799816},
     zbl = {0587.14024},
     language = {en},
     url = {https://www.numdam.org/item/CM_1985__55_3_269_0/}
}
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Wahl, Jonathan M. A characterization of quasi-homogeneous Gorenstein surface singularities. Compositio Mathematica, Tome 55 (1985) no. 3, pp. 269-288. https://www.numdam.org/item/CM_1985__55_3_269_0/

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