no. 1-2
Normal forms and moduli spaces of curve singularities with semigroup 〈2p,2q,2pq+d〉
Compositio Mathematica, Tome 76 (1990) no. 1-2, pp. 247-264. 
@article{CM_1990__76_1-2_247_0,
     author = {Luengo, Ignacio and Pfister, Gerhard},
     title = {Normal forms and moduli spaces of curve singularities with semigroup $\langle 2p, 2q, 2pq + d \rangle $},
     journal = {Compositio Mathematica},
     pages = {247--264},
     publisher = {Kluwer Academic Publishers},
     volume = {76},
     number = {1-2},
     year = {1990},
     mrnumber = {1078865},
     zbl = {0725.14021},
     language = {en},
     url = {http://www.numdam.org/item/CM_1990__76_1-2_247_0/}
}
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Luengo, Ignacio; Pfister, Gerhard. Normal forms and moduli spaces of curve singularities with semigroup $\langle 2p, 2q, 2pq + d \rangle $. Compositio Mathematica, Tome 76 (1990) no. 1-2, pp. 247-264. http://www.numdam.org/item/CM_1990__76_1-2_247_0/

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