1. B.P. Abbott , LIGO Scientifific Collaboration and Virgo Collaboration et al.: Observation of gravitational waves from a binary black hole merger. Phys. Rev. Lett. 116, 061102 (2016)
2. B.P. Abbott, LIGO Scientifific Collaboration and Virgo Collaboration et al. : Tests of general relativity with GW150914.Phys. Rev. Lett. 116,221101 (2016)
3. B.P. Abbott, LIGO Scientifific Collaboration and Virgo Collaboration et al. : GW151226: Observation of gravitational waves from a 22-solar-mass binary black hole coalescence. Phys. Rev. Lett. 116,241103 (2016)
4. The Event Horizon Telescope Collaboration et al: First M87 event horizon telescope results. I. The shadow of the supermassive black hole. Astrophys. J. Lett. 875, L1 (2019)
5. The Event Horizon Telescope Collaboration et al. :First M87 event horizon telescope results. IV. Imaging the central supermassive black hole. Astrophys. J. Lett. 875, L4 (2019)