@article{GDZPPN002100959, title = {The d-invariant of compact nilmanifolds.}, journal = {Inventiones mathematicae}, volume = {75}, year = {1984}, pages = {113-116}, zbl = {0558.55009}, url = {http://dml.mathdoc.fr/item/GDZPPN002100959} }
Singhof, W. The d-invariant of compact nilmanifolds.. Inventiones mathematicae, Tome 75 (1984) pp. 113-116. http://gdmltest.u-ga.fr/item/GDZPPN002100959/