Examples of projective billiards with open sets of periodic orbits
C. Fiorebe, Discrete and Continuous Dynamical Systems- Series A 44 (2024) 3287–3301.

The radial mass-subcritical NLS in negative order Sobolev spaces
R. Killip, S. Masaki, J. Murphy, M. Vifan, Discrete and Continuous Dynamical Systems 39 (2019) 553–583.

The energy-critical NLS with inverse-square potential
R. Killip, C. Miao, M. Vifan, J. Zhang, J. Zheng, Discrete and Continuous Dynamical Systems 37 (2017) 3831–3866.