“…The combined lists of Montgomery (2009) and Armstrong et al (2013) show only 23, after a few poorly credentialed stars are dismissed from the former list. A few more recent discoveries have swelled the list to more than 30: V455 And (Kozhevnikov 2015), ER UMa (de Miguel et al 2012;Oshima et al 2012Oshima et al , 2014, V1504 Cyg ), VW Hyi (Kato et al 2014b), KIC 7524178 ), TY PsA (Kato et al 2014a), V344 Lyr ), 1RXS J003828.7+250920 (Pavlenko et al 2016) (Gies et al 2013). Like their betterknown cousins, the periods are displaced from P orb by a few per cent, and the exact values wander slightly on a time-scale of weeks to months.…”