1.S. Gao, Invariant Descriptive Set Theory. Pure and Applied Mathematics, A Series of Monographs and Textbooks, 293. Taylor & Francis Group, 2009.
ISBN-13: 978-1-58488-793-5
2.S. Gao and A. S. Kechris, On the classification of Polish metric spaces up to isometry, Memoirs of the American Mathematical Society 161, no. 766, 2003, viii+78pp.
DOI: 10.1090/memo/0766
3.S. Gao and S. Jackson, Countable abelian group actions and hyperfinite equivalence relations, Inventiones Mathematicae 201 (2015), no. 1, 309-383.
DOI:10.1007/s00222-015-0603-y
4.S. Gao, S. Jackson and B. Seward, Group colorings and Bernoulli subflows, Memoirs of the American Mathematical Society 241, no. 1141, 2016, vi+241pp.
DOI:10.1090/memo/1141