G. Huang, V. Kaloshin, and A. Sorrentino, “Nearly circular domains which are integrable close to the boundary are ellipses,” Geometric and Functional Analysis, vol. 28, no. 2. Springer Nature, pp. 334–392, 2018.
LibreCat: https://research-explorer.ista.ac.at/record/8422
DOI: 10.1007/s00039-018-0440-4
arXiv: 1705.10601

V. Kaloshin and I. Rodnianski, “Diophantine properties of elements of SO(3),” Geometric And Functional Analysis, vol. 11, no. 5. Springer Nature, pp. 953–970, 2001.
LibreCat: https://research-explorer.ista.ac.at/record/8524
DOI: 10.1007/s00039-001-8222-8