참고문헌
- Geometry of algebraic curves E. Arbarello;M. Cornalba;P. A. Griffiths;J. Harris
- J. Math. Kyoto Univ. v.26 Generalized divisiors on Gorenstein curves and a theorem of Noether R. Hartshorne
- Varieties defined by quadratic equations, in: Questioni sulle varieta algebriche D. Mumford