1. Arbarello E.,Weierstrass points and moduli of curves, Compos. Math.29 (1974), 325–342.
2. Bardelli F., Del Centina A.,Osservazioni sullo spazio dei moduli delle curve trigonali, Acc. Naz. dei Lincei70 (1981), 96–100.
3. Canuto C.,On the monodromy of Weierstrass points, Annali di Matematica pura ed appl.136 (1984), 49–63.
4. Canuto C.,Weierstrass points on trigonal curves of genus 5, Bull. de la Soc. math. de France113 (1985), 123–142.
5. Coppens M.,The Weierstrass gap sequences of the total ramification, points of trigonal coverings of IP1. Proc. Kon. Ned. Akad. van Wetenschappen Series A88 (1985), 245–276 (Indag. Math.47 (1985)).