@article{JEMS_2008_10_1_a8,
     author = {Michael Farber and Dirk Sch\"utz},
     title = {Homological category weights and estimates for $\mathrm{cat}^1(X,\xi)$},
     journal = {Journal of the European Mathematical Society},
     pages = {243--266},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2008},
     doi = {10.4171/jems/110},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/110/}
}