I am seeking a list of automorphism groups of principally polarized abelian varieties in real dimensions 4, 6, 8. These automorphism groups are, of course, related to maximal finite subgroups of the integral symplectic groups $Sp(\mathbb{Z}^4, \omega)$, $Sp(\mathbb{Z}^6, \omega)$, etc.

Some lists and representations are available for dimension 4 (abelian surfaces) in Birkenhake-Lange's book "Complex Abelian Varieties", c.f. $\S 13.4$ and 13.4.4,5,9.

Reportedly there is some sort of table available for abelian surfaces in Kenji Ueno's paper ``On fibre spaces of normally polarized abelian varieties of dimension 2", J. Fac. Science, Univ. Tokyo, Sect. IA 18 37-95 1971 . However I cannot locate Ueno's paper online.

My question: can anybody provide an easy-to-read table describing the linear representations of the automorphism groups of abelian varieties in low dimensions?

For instance, a simple matrix representation of some maximal finite subgroups of $Sp(\mathbb{Z}^4, \omega)$, $Sp(\mathbb{Z}^6, \omega)$ would be much desired.