On the evolutionary history of EHB objects in binary systems with hot subdwarf companionsPustõlnik, Izold; Pustõnski, Vladislav-VeniaminBinary Stars as Critical Tools and Tests in Contemporary Astrophysics : International Astronomical Union : Symposium no. 240 held 22-25 August 2006 in Prague2006 / p. 186 https://ui.adsabs.harvard.edu/abs/2007IAUS..240..389P/abstract