Literature sources:

6m: BVRc photometry by V.P.Goranskij with the Russian 6-m telescope and SCORPIO focal reducer.
A47,47: UBVRc/Rj photometry by E.A.Barsukova andV.P.Goranskij with the SAI Crimean Station 60-cm Zeiss telescope and Apogee A47p CCD.
Abe,Bia,Dil,For,GS,Vil,San,Pui: CCD observations by W.G.Dillon, E.Guido and G.Sostero, H.Abe, G.Bianciardi, J.M.Villegas, A.Sanchez, X.Puig, E.Forne, CBET 1029, 1035 and 1038.
c7: VRc photometry by V.P.Goranskij with CCD SBIG ST-7 and CrAO 38-cm telescope.
Me: UBV photometry by N.V.Metlova with 60-cm telescope of SAI Crimean Station and V.M.Lyuty's photoelectric UBV photometer.
MM: UBVRc photometry by V.P.Goranskij with the SAO RAS 1-m Zeiss telescope and multymode photometer - polarimeter MMPP.
MMT: U.Munari, S.Moretti, S.Tomaselli, CBET 1027, 2007.
Nak,Ito,Mae,Mar: CCD observations by K.Nakajima, H.Itoh, H.Maehara, M.Martignoni, vsnet-alert 9668, 2007.
Pi: BVRc photometry by V.P.Goranskij with the SAI Crimean Station 50-cm meniscus Maksutov telescope and MEADE Pictor-416 CCD.
SO: UBVRc photometry by V.P.Goranskij and E.A.Barsukova with CCD EEV 42-40 and SAO 1-m telescope.
T: T.N.Tarasova, IBVS No.5807, 2007 (AAVSO data from Fig.1).
VS: V photometry by V.Soloviev with CCD SBIG ST-L-11K 3 and Kazan Univ. 30-cm telescope.