@article{GDZPPN00210850X, title = {Homotopy invariance of foliation Betti numbers.}, journal = {Inventiones mathematicae}, volume = {104}, year = {1991}, pages = {321-348}, zbl = {0756.46040}, url = {http://dml.mathdoc.fr/item/GDZPPN00210850X} }
Heitsch, James L.; Lazarov, Connor. Homotopy invariance of foliation Betti numbers.. Inventiones mathematicae, Tome 104 (1991) pp. 321-348. http://gdmltest.u-ga.fr/item/GDZPPN00210850X/