1. Kurylev, Y., Lassas, M., and Uhlmann, G., Inverse problems for Lorentzian
manifolds and non-linear hyperbolic equations, Invent.
Math., 2018, vol. 212, pp. 781–857.
2. Lassas, M., Uhlmann, G., and Wang, Y., Inverse problems for semilinear wave
equations on Lorentzian manifolds, Commun. Math.
Phys., 2018, vol. 360, pp. 555–609.
3. Lassas, M., Inverse problems for linear and non-linear hyperbolic equations,
Proc. Int. Congr. Math., 2018, vol. 3,
pp. 3739–3760.
4. Hintz, P. and Uhlmann, G., Reconstruction of Lorentzian manifolds from
boundary light observation sets, Int. Math. Res. Not.,
2019, vol. 22, pp. 6949–6987.
5. Hintz, P., Uhlmann, G., and Zhai, J., An inverse boundary value problem for
a semilinear wave equation on Lorentzian manifolds, Int. Math. Res.
Not., 2022, vol. 17, pp. 3181–3211.