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@article{IM_1984__78_143167, author = {W. Singhof}, title = {The d-invariant of compact nilmanifolds.}, journal = {Inventiones mathematicae}, pages = {113--116}, publisher = {mathdoc}, volume = {78}, year = {1984}, zbl = {0558.55009}, url = {http://geodesic.mathdoc.fr/item/IM_1984__78_143167/} }
W. Singhof. The d-invariant of compact nilmanifolds.. Inventiones mathematicae, Tome 78 (1984), pp. 113-116. http://geodesic.mathdoc.fr/item/IM_1984__78_143167/