@article{GT_2007_11_3_a13,
     author = {Salvetti, Mario and Settepanella, Simona},
     title = {Combinatorial {Morse} theory and minimality of hyperplane arrangements},
     journal = {Geometry & topology},
     pages = {1733--1766},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2007},
     doi = {10.2140/gt.2007.11.1733},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2007.11.1733/}
}