1. F. Angelini,UCLA Thesis, (1995).
2. L. Ein, R. Lazarsfeld,Seshadri constants on smooth surfaces, S. M. F. Astérisque,218, (1993), 177–186.
3. M. Green,A new proof of the explicit Noether-Lefschetz theorem, J. Differential Geom.,27, (1988), 155–159.
4. P. Griffiths, J. Harris,Principles of algebraic geometry, Wiley Interscience, New York, 1978.
5. P. Griffiths, J. Harris,On the Noether-Lefschetz theorem and some remarks on codimension two cycles, Math. Ann.,271, (1985), 31–51.