Tangent cones at Gorenstein singularities
Compositio Mathematica, Tome 40 (1980) no. 2, pp. 167-175. 
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     author = {Sally, Judith D.},
     title = {Tangent cones at {Gorenstein} singularities},
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     pages = {167--175},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {40},
     number = {2},
     year = {1980},
     mrnumber = {563540},
     zbl = {0389.13009},
     language = {en},
     url = {http://www.numdam.org/item/CM_1980__40_2_167_0/}
}
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Sally, Judith D. Tangent cones at Gorenstein singularities. Compositio Mathematica, Tome 40 (1980) no. 2, pp. 167-175. http://www.numdam.org/item/CM_1980__40_2_167_0/

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