Sources.

A5: V.P.Goranskij with the 50-cm Maksutov telescope of the Moscow University Crimean Station and UBV(RI)c photometer with the CCD Apogee Alta U8300.
MB U.Munari, D.P.K.Banerjee, F.Castellani, S.Dallaporta, A.Maitan, and A.Vagnozzi, Astronomer's Telegram No.14267, 2020.
MM: A.S.Vinokurov with the SAO 1-m Zeiss telescope and MMPP photometer - polarimeter based on CCD E2V42-40.
MS: U. Munari, A.Siviero, A.Vagnozzi, K.Sokolovsky, E.Aydi, Astronomer's Telegram No.13905, 2020.
PJ,MV: P. Jordanoff, M. Vrastak, Facebook, Cataclysmic Variables.
SK: K.Sokolovsky, S.Karpov, M.Masek, P.Janecek, J.Jurysek, J.Ebr, R.Cunniffe, P.Travnicek, M.Prouza, M.Jelinek, J.Strobl, S.Korotkiy, Astronomer's Telegram No.13904, 2020.
SO: V.P.Goranskij with the SAO 1-m Zeiss telescope and UBV(RI)c photometer based on CCD EEV 42-40.
KS,Sa,No,Ki,KM,HS,EE: S.Korotkiy, K.Sokolovsky, A.Novichonok, Y.Sano, S.Kiyota, K.Makarov, H.Sielewicz, E.Emilianov, CBAT http://www.cbat.eps.harvard.edu/unconf/followups/J00114297+6611190.html
VS: G.Holmberg, K.Wenzel, vsnet-alert 24529, 2020. P.A.Dubovsky, M.Larsson, K.Wenzel, vsnet-alert 25176, 2020.