References
- Brown, K. S. (1974). Euler characteristics of discrete groups and G-spaces. Invent. Math. 27:229โ264.
- Chiswell, I. M. (1976). Euler characteristics of groups. Math. Z. 147:1โ11.
- Hatcher, A. (2001). Algebraic Topology. Cambridge, UK: Cambridge University Press.
- Kapovich, I., Myasnikov, A., Weidmann, R. (2005). Foldings, graphs of groups and the membership problem. Int. J. Algebra Comput. 15:95โ128.
- Lackenby, M. (2005). Expanders, rank and graphs of groups. Israel J. Math. 146:357โ370.
- Linnell, P. A. (1983). On accessibility of groups. J. Pure Appl. Algebra 30:39โ46.
- Lรผck, W. (1994). Approximating L2-invariants by their finite-dimensional analogues. Geom. Funct. Anal. 4:455โ481.
- Lรผck, W. (2008). L2โBetti numbers of some amalgamated free products of groups. Appendix to the paper โFree entropy dimension in amalgamated free productsโ by N.P. Brown, K.J. Dykema, K. Jung. Proc. London Math. Soc. 97:339โ367.
- Mednykh, A. D. (1978). Determination of the number of nonequivalent coverings over a compact Riemann surface. Soviet Math. Dokl. 19:318โ320.
- Pansu, P. (1996). Introduction to L2โBetti numbers. In: Gerard, B., Lovric, M., Min-Oo, M., Wang McKenzie, Y.-K., eds. Riemannian Geometry. Fields Institute, UK: American Mathematical Society, pp. 53โ86.
- Pappas, N. (2015). Rank Gradient and p-gradient of Amalgamated Free Products and HNN Extensions. Commun. Algebra 43:4515โ4527.
- Reznikov, A. (1996). Volumes of discrete groups and topological complexity of homology spheres. Math. Ann. 306:547โ554.
- Scott, P., Wall, C. T. C. (1979). Topological methods in group theory. In: Wall, C. T. C., ed. Homological Group Theory, London Mathematical Society Lecture Note Series, Vol. 36. Cambridge, UK: Cambridge University Press, pp. 137โ203.
- Serre, J. P. (1971). Cohomologie des groupes discrets, Prospects in mathematics, Annals of Mathematics Studies, Vol. 70. Princeton, NJ: Princeton University Press, pp. 77โ169.
- Serre, J. P. (1980). Trees. New York: Springer.
- Stallings, J. R. (2002). An extension theorem for Euler characteristics of groups. Geom. Dedic. 92:3โ39.
- Sykiotis, M. (2004). Stable representatives for symmetric automorphisms of groups and the general form of the Scott conjecture. Trans. Am. Math. Soc. 356:2405โ2441.
- Sykiotis, M. (2005). On subgroups of finite complexity in groups acting on trees. J. Pure Appl. Algebra 200:1โ23.
- Wall, C. T. C. (1961). Rational Euler characteristics. Proc. Cambridge Philos. Soc. 57:182โ183.