@article{MM2_1994__83_3-4_155946,
     author = {Fernando Torres},
     title = {Weierstrass points and double converings of curves. {With} application: {Symmetric} numerical semigroup which cannot be realized as {Weierstrass} semigroups.},
     journal = {Manuscripta mathematica},
     pages = {39--58},
     publisher = {mathdoc},
     volume = {83},
     number = {3-4},
     year = {1994},
     zbl = {0838.14025},
     url = {http://geodesic.mathdoc.fr/item/MM2_1994__83_3-4_155946/}
}