@article{JohnsonAkiyamaBlackburnetal.2023,
  author    = {Michael D. Johnson and Kazunori Akiyama and Lindy Blackburn and Katherine L. Bouman and Avery E. Broderick and Vitor Cardoso and Rob P. Fender and Christian M. Fromm and Peter Galison and Jos{\´e} L. G{\´o}mez and Daryl Haggard and Matthew L. Lister and Andrei P. Lobanov and Sera Markoff and Ramesh Narayan and Priyamvada Natarajan and Tiffany Nichols and Dominic W. Pesce and Ziri Younsi and Andrew Chael and Koushik Chatterjee and Ryan Chaves and Juliusz Doboszewski and Richard Dodson and Sheperd S. Doeleman and Jamee Elder and Garret Fitzpatrick and Kari Haworth and Janice Houston and Sara Issaoun and Yuri Y. Kovalev and Aviad Levis and Rocco Lico and Alexandru Marcoci and Niels C. M. Martens and Neil M. Nagar and Aaron Oppenheimer and Daniel C. M. Palumbo and Angelo Ricarte and Mar{\´i}a  J. Rioja and Freek Roelofs and Ann C. Thresher and Paul Tiede and Jonathan Weintroub and Maciek Wielgus},
  title     = {Key science goals for the next-generation Event Horizon Telescope},
  journal   = {Galaxies},
  volume    = {11},
  number    = {3},
  doi       = {10.3390/galaxies11030061},
  year      = {2023},
}