Geodesic
Automorphisms of even lattices arising in connection with automorphisms of algebraic $K3$ -surfaces
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1983), pp. 19-21
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Let $H(X)$ denote the group of all automorphisms of an algebraic $K3$-surface $X$ acting trivially on algebraic cycles. This group is cyclic and we denote the order of $H(X)$ by $m(X)$. We derive some results concerning possible values of $m(X)$. These results follow from some more general theorems on even lattices and their automorphisms. 
@article{VMUMM_1983_2_a3,
     author = {S. P. Vorontsov},
     title = {Automorphisms of even lattices arising in connection with automorphisms of algebraic $K3$ -surfaces},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {19--21},
     year = {1983},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1983_2_a3/}
}
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S. P. Vorontsov. Automorphisms of even lattices arising in connection with automorphisms of algebraic $K3$ -surfaces. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1983), pp. 19-21. http://geodesic.mathdoc.fr/item/VMUMM_1983_2_a3/