Differentials of the Voronoi complex of perfect forms of rank 6 mod GL_6(Z),
from Philippe Elbaz-Vincent, Institut Fourier, Grenoble, France.

From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,
http://ljk.imag.fr/membres/Jean-Guillaume.Dumas/simc.html

http://www-fourier.ujf-grenoble.fr/-Informations-personnelles-.html?P=pev

D_6  Smith Invariants = [ 1:156 ]
D_7  Smith Invariants = [ 1:307 2:3 60:2 ]
D_8  Smith Invariants = [ 1:320 2:1 6:2 12:1 ]
D_9  Smith Invariants = [ 1:217 2:3 ]
D_10 Smith Invariants = [ 1:120 ]