@incollection{BCH1994,
  author    = {Baum, Paul and Connes, Alain and Higson, Nigel},
  title     = {Classifying space for proper actions and {K}-theory of group {$C^*$}-algebras},
  booktitle = {{$C^*$}-Algebras: 1943--1993},
  editor    = {Doran, Robert S.},
  series    = {Contemporary Mathematics},
  volume    = {167},
  pages     = {241--291},
  publisher = {American Mathematical Society},
  address   = {Providence, RI},
  year      = {1994},
  doi       = {10.1090/conm/167/1292018},
  note      = {\href{https://doi.org/10.1090/conm/167/1292018}{DOI}},
  url       = {https://doi.org/10.1090/conm/167/1292018}
}

@article{HLS2002,
  author  = {Higson, Nigel and Lafforgue, Vincent and Skandalis, Georges},
  title   = {Counterexamples to the {Baum--Connes} conjecture},
  journal = {Geometric and Functional Analysis},
  volume  = {12},
  number  = {2},
  pages   = {330--354},
  year    = {2002},
  doi     = {10.1007/s00039-002-8249-5},
  note      = {\href{https://doi.org/10.1007/s00039-002-8249-5}{DOI}},
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}

@article{Austin2013,
  author        = {Austin, Tim},
  title         = {Rational group ring elements with kernels having irrational dimension},
  journal       = {Proceedings of the London Mathematical Society},
  series        = {3},
  volume        = {107},
  number        = {6},
  pages         = {1424--1448},
  year          = {2013},
  doi           = {10.1112/plms/pdt029},
  note      = {\href{https://doi.org/10.1112/plms/pdt029}{DOI}},
  eprint        = {0909.2360},
  archivePrefix = {arXiv},
  primaryClass  = {math.GR},
  url           = {https://doi.org/10.1112/plms/pdt029}
}

@article{Luck2002,
  author  = {L{\"u}ck, Wolfgang},
  title   = {The relation between the {Baum--Connes} Conjecture and the {Trace} Conjecture},
  journal = {Inventiones Mathematicae},
  volume  = {149},
  number  = {1},
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  year    = {2002},
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  note      = {\href{https://doi.org/10.1007/s002220200215}{DOI}},
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@article{Osajda2020,
  author        = {Osajda, Damian},
  title         = {Small cancellation labellings of some infinite graphs and applications},
  journal       = {Acta Mathematica},
  volume        = {225},
  number        = {1},
  pages         = {159--191},
  year          = {2020},
  doi           = {10.4310/ACTA.2020.v225.n1.a3},
  note      = {\href{https://doi.org/10.4310/ACTA.2020.v225.n1.a3}{DOI}},
  eprint        = {1406.5015},
  archivePrefix = {arXiv},
  primaryClass  = {math.GR},
  url           = {https://doi.org/10.4310/ACTA.2020.v225.n1.a3}
}

@book{BH1999,
  author    = {Bridson, Martin R. and Haefliger, Andr{\'e}},
  title     = {Metric Spaces of Non-Positive Curvature},
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  publisher = {Springer-Verlag},
  address   = {Berlin},
  year      = {1999},
  doi       = {10.1007/978-3-662-12494-9},
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@article{LPS1988,
  author  = {Lubotzky, Alexander and Phillips, Ralph and Sarnak, Peter},
  title   = {{Ramanujan} graphs},
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  number  = {3},
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  year    = {1988},
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@article{HambletonPedersen2004,
  author  = {Hambleton, Ian and Pedersen, Erik K.},
  title   = {Identifying assembly maps in {K}- and {L}-theory},
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  number  = {1--2},
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@article{Kranz2021,
  author        = {Kranz, Julian},
  title         = {An identification of the {Baum--Connes} and {Davis--L{\"u}ck} assembly maps},
  journal       = {M{\"u}nster Journal of Mathematics},
  volume        = {14},
  number        = {2},
  pages         = {509--536},
  year          = {2021},
  doi           = {10.17879/06089641898},
  note      = {\href{https://doi.org/10.17879/06089641898}{DOI}},
  eprint        = {2009.11964},
  archivePrefix = {arXiv},
  primaryClass  = {math.KT},
  url           = {https://www.uni-muenster.de/FB10/mjm/vol_14/mjm_vol_14_19.pdf}
}

@article{LiNowakPooya2024,
  author = {Li, Kang and Nowak, Piotr W. and Pooya, Sanaz},
  title = {Higher {Kazhdan} projections, {$\ell^2$}-{Betti} numbers and {Baum--Connes} conjectures},
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  note = {\href{https://doi.org/10.4171/JNCG/529}{DOI}}
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@article{HigsonKasparov2001,
  author = {Higson, Nigel and Kasparov, Gennadi},
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@article{MineyevYu2002,
  author = {Mineyev, Igor and Yu, Guoliang},
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@article{Lafforgue2012,
  author = {Lafforgue, Vincent},
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@article{Gilbert1952,
  author = {Gilbert, Edgar N.},
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@article{Varshamov1957,
  author = {Varshamov, Rom Rubenovich},
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@article{Dodziuk1984,
  author = {Dodziuk, Jozef},
  title = {Difference equations, isoperimetric inequality and transience of certain random walks},
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@article{AlonMilman1985,
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@article{Gromov2003,
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@article{BaumConnes2000,
  author = {Baum, Paul and Connes, Alain},
  title = {Geometric {K}-theory for {Lie} groups and foliations},
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@incollection{Atiyah1976,
  author = {Atiyah, Michael F.},
  title = {Elliptic operators, discrete groups and von {Neumann} algebras},
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@article{GLSZ2000,
  author = {Grigorchuk, Rostislav I. and Linnell, Peter A. and Schick, Thomas and {\.{Z}uk}, Andrzej},
  title = {On a question of {Atiyah}},
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@article{DicksSchick2002,
  author = {Dicks, Warren and Schick, Thomas},
  title = {The spectral measure of certain elements of the complex group ring of a wreath product},
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@article{PichotSchickZuk2015,
  author = {Pichot, Mika{\"e}l and Schick, Thomas and {\.{Z}uk}, Andrzej},
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@article{Grabowski2016,
  author = {Grabowski, {\L}ukasz},
  title = {Irrational {$\ell^2$} invariants arising from the lamplighter group},
  journal = {Groups, Geometry, and Dynamics},
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