The WEBT BL Lacertae Campaign 2001 and its extension. Optical light curves and colour analysis 1994-2002

VILLATA M; RAITERI C.M; KURTANIZDE O.M; NIKOLASHVILI M.G; IBRAHIMOV M.A; PAPADAKIS I.E; TOSTI G; HROCH F; TAKALO; L.O; SILLANPAEAE A; HAGEN-THORN V.A; LARIONOV V.M; SCHWARTZ R.D; BASLER J; BROWN L.F; BALONEK T.J; BENITEZ E; RAMIREZ A; SADUN A.C; BOLTWOOD P; CARINI M.T; BARNABY D; COLOMA J.M; ROS J.A; DAI B.Z; XIE G.Z; MATTOX J.R; RODRIGUEZ D; ASFANDIYAROV I.M; ATKERSON A; BEEM J.L; BLOOM S.D; CHANTURIYA S.M; CIPRINI S; CRAPANZANO S; DE DIEGO J.A; EFIMOVA N.V; GARDIOL D; GUERRA J.C; KAHHAROV B.B; KAPANADZE B.Z; KARTTUNEN H; KATO T; KIMERIDZE G.N; KUDRYAVTSEVA N.A; LAINELA M; LANTERI L; LARIONOVA E.G; MAESANO M; MARCHILI N; MASSONE G; MONROE T; MONTAGNI F; NESCI R; NILSSON K; NOBLE J.C; NUCCIARELLI G; L. OSTORERO; PAPAMASTORAKIS J; PASANEN M; PETERS C.S; PURSIMO T; REIG P; RYLE W; SCLAVI S; SIGUA L.A; UEMURA M; WILLS W