BM Cas a long period eclipsibinary with a supergiant and common envelopeKalv, Peep; Harvig, Voldemar; Pustõlnik, IzoldZdenek Kopal's Binary Star Legacy2004 / [4] p https://www.researchgate.net/publication/251265329_BM_Cas_A_Long-Period_Eclipsing_Binary_with_a_Supergiant_and_a_Common_Envelope