The WEBT campaign to observe AO 0235+16 in the 2003--2004 observing season. Results from radio-to-optical monitoring and XMM-Newton observations

RAITERI C.M; VILLATA M; IBRAHIMOV M.A; LARIONOV V.M; KADLER M; ALLER H.D; ALLER M.F; KOVALEV Y.Y; LANTERI L; NILSSON K; PAPADAKIS J; PURSIMO T; ROMERO G.E; TERAESRANTA H; TORNIKOSKI H; ARKHAROV A.A; BARNABY D; BERDYUGIN A; BOETTCHER M; BYCKLING K; CARINI M.T; CAROSATI M; CELLONE S.A; CIPRINI S; COMBI J.A; CRAPANZANO S; CROWE R; DI PAOLA A; DOLCI M; FUHRMANN L; GU M; HAGEN-THORN V.A; HAKALA P; IMPELLIZZERI V; JORSTAD S; KERP J; KIMERIDZE G.N; KOVALEV YU.A; KRAUS A; KRICHBAUM T.P; KURTANIDZE O.M; LAEHTEENMAEKI A; LINDFORS E; MINGALIEV M.G; NESCI R; NIKOLASHVILI M.G; OHLERT J; ORIO M; L. OSTORERO; PASANEN M; PATI A; POTEET C; ROS E; ROS J.A; SHASTRI P; SIGUA L.A; SILLANPAEAE A; SMITH N; TAKALO L.O; TOSTI G; VASILEVA A; WAGNER S.J; WALTERS R; WEBB J.R; WILLS W; WITZEL A; XILOURIS E