@article{GDZPPN002064413, title = {Affin manifolds with nilpotent holonomy.}, journal = {Commentarii mathematici Helvetici}, volume = {56}, year = {1981}, pages = {487-523}, zbl = {0516.57014}, url = {http://dml.mathdoc.fr/item/GDZPPN002064413} }
Fried, D.; Goldman, W.; Hirsch, M.W. Affin manifolds with nilpotent holonomy.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 487-523. http://gdmltest.u-ga.fr/item/GDZPPN002064413/