1. Ahlfors, L.V.: Lectures on quasiconformal mappings, University Lecture Series, vol. 38, second edn. American Mathematical Society, Providence, RI (2006). With supplemental chapters by C. J. Earle, I. Kra, M. Shishikura and J. H. Hubbard
2. Akofor, E.: On Lipschitz retraction of finite subsets of normed spaces. Israel J. Math. 234(2), 777–808 (2019)
3. Akofor, E., Kovalev, L.V.: Growth rate of Lipschitz constants for retractions between finite subset spaces. Studia Math. 260(3), 317–326 (2021)
4. Andersen, R.N., Marjanović, M.M., Schori, R.M.: Symmetric products and higher-dimensional dunce hats. Topology Proc. 18, 7–17 (1993)
5. Assouad, P.: Plongements lipschitziens dans $${ R}^{n}$$. Bull. Soc. Math. France 111(4), 429–448 (1983)