Gromov, M. (2009). Singularities, Expanders and Topology of Maps. Part 1: Homology Versus Volume in the Spaces of Cycles Geometric and Functional Analysis, 19 (3), 743-841 DOI: 10.1007/s00039-009-0021-7
Gromov, M. (2010). Singularities, Expanders and Topology of Maps. Part 2: from Combinatorics to Topology Via Algebraic Isoperimetry Geometric and Functional Analysis, 20 (2), 416-526 DOI: 10.1007/s00039-010-0073-8
LUBOTZKY, A., SAMUELS, B., & VISHNE, U. (2005). Explicit constructions of Ramanujan complexes of type European Journal of Combinatorics, 26 (6), 965-993 DOI: 10.1016/j.ejc.2004.06.007
Jacob Fox, Mikhail Gromov, Vincent Lafforgue, Assaf Naor, & Janos Pach (2010). Overlap properties of geometric expanders ArXiv arXiv: 1005.1392v1
Matthew Kahle (2010). Topological expanders ArXiv arXiv: 1012.5316v1
Misha Gromov, Larry Guth (2011). Generalizations of the Kolmogorov-Barzdin embedding estimates ArXiv : arXiv: 1103.3423v1

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