@article{9136,
  author = {Isaac Shlosman and Juhan Frank and Mitchell Begelman},
  title = {Bars within bars: a mechanism for fuelling active galactic nuclei},
  year = {1989},
  journal = {Nature},
  volume = {338},
  pages = {45-47},
  month = {3/1989},
  issn = {0028-0836},
  doi = {10.1038/338045a0},
}