#### Volume 2, issue 2 (2002)

 1 M Bestvina, N Brady, Morse theory and finiteness properties of groups, Invent. Math. 129 (1997) 445 MR1465330 2 M Brady, private communication (2002) 3 N Brady, J Crisp, Two-dimensional Artin groups with $\mathrm{CAT}(0)$ dimension three, from: "Proceedings of the Conference on Geometric and Combinatorial Group Theory, Part I (Haifa, 2000)" (2002) 185 MR1950878 4 M R Bridson, On the existence of flat planes in spaces of nonpositive curvature, Proc. Amer. Math. Soc. 123 (1995) 223 MR1273477 5 M R Bridson, Length functions, curvature and the dimension of discrete groups, Math. Res. Lett. 8 (2001) 557 MR1851271 6 M R Bridson, A Haefliger, Metric spaces of non-positive curvature, Grundlehren der Mathematischen Wissenschaften 319, Springer (1999) MR1744486 7 K S Brown, Cohomology of groups, Graduate Texts in Mathematics 87, Springer (1982) MR672956 8 W Dicks, I J Leary, Presentations for subgroups of Artin groups, Proc. Amer. Math. Soc. 127 (1999) 343 MR1605948 9 S Eilenberg, T Ganea, On the Lusternik–Schnirelmann category of abstract groups, Ann. of Math. $(2)$ 65 (1957) 517 MR0085510 10 W Hurewicz, H Wallman, Dimension Theory, Princeton Mathematical Series, v. 4, Princeton University Press (1941) MR0006493 11 J R Stallings, On torsion-free groups with infinitely many ends, Ann. of Math. $(2)$ 88 (1968) 312 MR0228573 12 R G Swan, Groups of cohomological dimension one, J. Algebra 12 (1969) 585 MR0240177 13 H van der Lek, The Homotopy Type of Complex Hyperplane Complements, PhD thesis, University of Nijmegen (1983)