@article{GDZPPN002036991,
title = {On the hard Lefschetz theorem in intersection homology for complex varieties with isolated singularities.},
journal = {Aequationes mathematicae},
volume = {33},
year = {1987},
pages = {240-263},
zbl = {0648.14009},
url = {http://dml.mathdoc.fr/item/GDZPPN002036991}
}
Kaup, Ludger; Fieseler, K.-H. On the hard Lefschetz theorem in intersection homology for complex varieties with isolated singularities.. Aequationes mathematicae, Tome 33 (1987) pp. 240-263. http://gdmltest.u-ga.fr/item/GDZPPN002036991/