1. Dalet, A.: Free spaces over countable compact metric spaces. Proc. Am. Math. Soc. (electronically published on February 25) (2015) doi: 10.1090/S0002-9939-2015-12518-X (to appear in print)
2. Dalet, A.: Free spaces over some proper metric spaces. Mediterr. J. Math. (electronically published on August 12) (2014) doi: 10.1007/s00009-014-0455-5 (to appear in print)
3. Dalet, A., Kaufmann, P., Procházka, A.: Free spaces over ultrametric spaces are never isometric to ℓ1 (2015). http://arxiv.org/pdf/1502.02719.pdf
4. David, G., Semmes, S.: Fractured fractals and broken dreams, vol. 7 of Oxford Lecture Series in Mathematics and its Applications. Self-similar geometry through metric and measure. The Clarendon Press, Oxford University Press, New York (1997)
5. Evans, S.N.: Probability and real trees, vol 1920 of Lecture Notes in Mathematics, Springer, Berlin, 2008. Lectures from the 35th Summer School on Probability Theory held in Saint-Flour, July 6–23 (2005)