@article{GDZPPN002238586, title = {Betti numbers and Euler's formula for combinatorial foliations.}, journal = {Manuscripta mathematica}, volume = {94}, year = {1997}, pages = {239-248}, zbl = {0876.57042}, url = {http://dml.mathdoc.fr/item/GDZPPN002238586} }
Elek, Gábor. Betti numbers and Euler's formula for combinatorial foliations.. Manuscripta mathematica, Tome 94 (1997) pp. 239-248. http://gdmltest.u-ga.fr/item/GDZPPN002238586/