REFERENCES
- Buchweitz , R. O. ( 1980 ). On Zariski's criterion for equisingularity and non-smoothable monomial curves. Preprint 113, University of Hannover .
- Coppens , M. ( 1985 ). The Weierstrass gap sequences of the total ramification points of trigonal coverings of ℙ1 . Indag. Math. 47 : 245 – 276 .
- Coppens , M. ( 1986 ). The Weierstrass gap sequences of the ordinary ramification points of trigonal coverings of ℙ1: Existence of a kind of Weierstrass gap sequences . J. Pure Appl. Algebra 43 : 11 – 25 .
- Kim , S. J. ( 1990 ). On the existence of Weierstrass gap sequences on trigonal curves . J. Pure Appl. Algebra 63 : 171 – 180 .
- Kim , S. J. , Komeda , J. ( 2001 ). The Weierstrass semigroup of a pair and moduli in ℳ3 . Bol. Soc. Bras. Mat. 32 : 149 – 157 .
- Komeda , J. ( 1983 ). On Weierstrass points whose first non-gaps are four . J. reine angew. Math. 341 : 68 – 86 .
- Komeda , J. ( 1992 ). On the existence of Weierstrass points whose first non-gaps are five . Manuscripta Math. 76 : 193 – 211 .
- Komeda , J. ( 1998 ). Non-Weierstrass numerical semigroups . Semigroup Forum 57 : 157 – 185 .
- Komeda , J. , Ohbuchi , A. ( 2004 ). Weierstrass points with first non-gap four on a double covering of a hyperelliptic curve . Serdica Math. J. 30 : 43 – 54 .
- Komeda , J. , Ohbuchi , A. (2007). On double coverings of a pointed non-singular curve with any Weierstrass semigroup. Tsukuba J. Math. 31:205–215.
- Maclachlan , C. ( 1971 ). Weierstrass points on compact Riemann surfaces . J. London Math. Soc. 3 : 722 – 724 .
- Torres , F. ( 1994 ). Weierstrass points and double coverings of curves with application: Symmetric numerical semigroups which cannot be realized as Weierstrass semigroups . Manuscripta Math. 83 : 39 – 58 .
- Communicated by S. Kleiman.