@article{JEMS_2000_2_3_a2,
     author = {Gerard van der Geer and Toshiyuki Katsura},
     title = {On a stratification of the moduli of {K3} surfaces},
     journal = {Journal of the European Mathematical Society},
     pages = {259--290},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {2000},
     doi = {10.1007/s100970000021},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s100970000021/}
}