BM Cas - a long-period eclipsing young supergiant binary system in common envelope stagePustõlnik, Izold; Kalv, Peep; Harvig, Voldemar; Aas, ToomasAstronomical and astrophysical transactions2007 / 4/5, p. 339-350https://www.tandfonline.com/doi/abs/10.1080/10556790701553532