@article{GDZPPN002200503,
title = {Hodge groups of K3 surfaces.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {341},
year = {1983},
pages = {193-220},
zbl = {0506.14034},
url = {http://dml.mathdoc.fr/item/GDZPPN002200503}
}
Zarhin, Yu.G. Hodge groups of K3 surfaces.. Journal für die reine und angewandte Mathematik, Tome 341 (1983) pp. 193-220. http://gdmltest.u-ga.fr/item/GDZPPN002200503/