TY - CPAPER AU - G. Madejski AU - C. Done AU - T. Turner AU - R. Mushotzky AU - P. Serlemitsos AU - Fabrizio Fiore AU - Marek Sikora AU - Mitchell Begelman BT - unknown CY - College Park, Maryland (USA) DO - 10.1063/1.46743 PB - AIP PP - College Park, Maryland (USA) PY - 1994 T2 - unknown TI - Solving the mystery of the periodicity in the Seyfert galaxy NGC 6814 UR - http://link.aip.org/link/APCPCS/v313/i1/p59/s1\&Agg=doi ER -