@article{4417,
  author = {Isaac Shlosman and Mitchell Begelman and Juhan Frank},
  title = {The fuelling of active galactic nuclei},
  year = {1990},
  journal = {Nature},
  volume = {345},
  pages = {679-686},
  month = {6/1990},
  issn = {0028-0836},
  doi = {10.1038/345679a0},
}