Long period variations of dm-radio and X-ray fluxes in three X-class flares H. Mészárosová, M. Karlický, J. Rybák, F. Fárník and K. Jiřička A&A, 460 3 (2006) 865-874 Published online: 12 September 2006 DOI: 10.1051/0004-6361:20065750