@conference{5503,
  author = {G. Madejski and C. Done and T. Turner and R. Mushotzky and P. Serlemitsos and Fabrizio Fiore and Marek Sikora and Mitchell Begelman},
  title = {Solving the mystery of the periodicity in the Seyfert galaxy NGC 6814},
  year = {1994},
  journal = {unknown},
  publisher = {AIP},
  address = {College Park, Maryland (USA)},
  url = {http://link.aip.org/link/APCPCS/v313/i1/p59/s1\&Agg=doi},
  doi = {10.1063/1.46743},
}