no. 2
A remark on the paper of A. Tannenbaum
Compositio Mathematica, Tome 51 (1984) no. 2, pp. 185-187. 
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     author = {Greuel, Gert-Martin},
     title = {A remark on the paper of {A.} {Tannenbaum}},
     journal = {Compositio Mathematica},
     pages = {185--187},
     publisher = {Martinus Nijhoff Publishers},
     volume = {51},
     number = {2},
     year = {1984},
     mrnumber = {739732},
     zbl = {0556.14009},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1984__51_2_185_0/}
}
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Greuel, Gert-Martin. A remark on the paper of A. Tannenbaum. Compositio Mathematica, Tome 51 (1984) no. 2, pp. 185-187. http://archive.numdam.org/item/CM_1984__51_2_185_0/

[1] J. Milnor: Singular points of complex hypersurfaces. Princeton: Ann. Math. Studies 61, 1968. | MR | Zbl

[2] J.P. Serre: Groupes algébriques et corps de classes. Paris: Hermann 1959. | Zbl

[3] A. Tannenbaum: On the classical characteristic linear series of plane curves with nodes and cuspidal points: two examples of Beniamino Segre. Comp. Math. 51 (1984) 169-183. | Numdam | MR | Zbl