no. 2
On osculating cones and the Riemann-Kempf singularity theorem for hyperelliptic curves, trigonal curves, and smooth plane quintics
Compositio Mathematica, Tome 65 (1988) no. 2, pp. 177-199. 
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     author = {Bardelli, Fabio and Verdi, Luisella},
     title = {On osculating cones and the {Riemann-Kempf} singularity theorem for hyperelliptic curves, trigonal curves, and smooth plane quintics},
     journal = {Compositio Mathematica},
     pages = {177--199},
     publisher = {Kluwer Academic Publishers},
     volume = {65},
     number = {2},
     year = {1988},
     mrnumber = {932643},
     zbl = {0662.14015},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1988__65_2_177_0/}
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Bardelli, Fabio; Verdi, Luisella. On osculating cones and the Riemann-Kempf singularity theorem for hyperelliptic curves, trigonal curves, and smooth plane quintics. Compositio Mathematica, Tome 65 (1988) no. 2, pp. 177-199. http://archive.numdam.org/item/CM_1988__65_2_177_0/

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