Long term variability of Cygnus X-1 - V. State definitions with all sky monitors V. Grinberg, N. Hell, K. Pottschmidt, M. Böck, M. A. Nowak, J. Rodriguez, A. Bodaghee, M. Cadolle Bel, G. L. Case, M. Hanke et al. (7 more) A&A, 554 (2013) A88 Published online: 07 June 2013 DOI: 10.1051/0004-6361/201321128