An example concerning a question of Zariski Ignacio Luengo — 1985 Bulletin de la Société Mathématique de France
Normal forms and moduli spaces of curve singularities with semigroup 〈 2 p , 2 q , 2 p q + d 〉 Ignacio Luengo; Gerhard Pfister — 1990 Compositio Mathematica
Germs of holomorphic vector fields in C3 without a separatrix. Ignacio Luengo; Xavier Gómez-Mont — 1992 Inventiones mathematicae