Literature sources:

A47: UBVRc photometry by V.P.Goranskij with SAI Crimean Station 60-cm telescope and CCD Apogee-47p. V=V(A47)-0.47. U=U(SO)-0.35.
BPB: A.Baklanov, E.Pavlenko, E.Berezina, ATel 1514, 2008. (Rc=DeltaR(BPB)+0.50).
c7: VRc photometry by V.P.Goranskij with CrAO 38-cm telescope and CCD SBIG ST-7.
DR: M.J.Darnley, V.A.R.M.Ribeiro, M.F.Bode, U.Munari, AsAp V.530, A70, 2011.
JM: R.Jurdana-Sepic, U.Munari, IBVS 5839, 2008.
Me: UBV photometry by N.V.Metlova with SAI Crimean Station 60-cm telescope and Lyuty's photoelectric photometer.
Pi: VRc photometry by V.P.Goranskij with SAI Crimean Station 50 cm Maksutov telescope and CCD MEADE Pictor-416.
SO: UBV photometry by V.P.Goranskij with SAO 1-m telescope and CCD EEV 42-40.
SCV: S.Shugarov, D.Chochol, I.Volkov, P.Zemko, Variable Stars, The Galactic Halo and Galaxy Formation, International Conference held in Zvenigorod, Russia, 12-16 October 2009, poster paper.
TM: T.Tomov, M.Mikolajewski, E.Ragan, E.Swierczynski, P.Wychudzki, ATel 1475, 2008; T.Tomov, M.Mikolajewski, T.Brozek, E.Ragan, E.Swierczynski, P.Wychudzki, C.Galan, ATel 1485, 2008.

Dwo,Kiy,Kli,Mae,Nak,Nic,Sos: S.Dworak, S.Kiyota, G.Klingenberg, H.Maehara, K.Nakajima, M.Nicholson, G.Sostero (VSNET).