The candidate 31.4 day periodicity from Cyg X-3 is an artifact of ASM data sampling - Tomsick, John A.; Vilhu, Osmi; Wilms, Joern; Bodaghee, Arash; Pottschmidt, Katja; Rodriguez, Jerome; Levine, Al; Hakala, Pasi; Hannikainen, Diana (The Astronomer's Telegram, 2011)
Keywords: X-ray; Binary; Black Hole; Neutron Star; Variables