@article{10_4171_dm_542,
     author = {Kieran G. O'Grady},
     title = {Decomposable cycles and {Noether-Lefschetz} loci},
     journal = {Documenta mathematica},
     pages = {661--687},
     year = {2016},
     volume = {21},
     doi = {10.4171/dm/542},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/542/}
}