Chao, D. C.-Y. Physical Cosmology, MPI for Astrophysics, Max Planck Society;
Suyu, S. H. Physical Cosmology, MPI for Astrophysics, Max Planck Society;
Bonvin, V., Chan, J. H. H., Millon, M., Rojas, K., Courbin, F., Chen, G.-C.-F., et al. (2018). COSMOGRAIL - XVII. Time delays for the quadruply imaged quasar PG 1115+080. Astronomy and Astrophysics, 616: A183. doi:10.1051/0004-6361/201833287.