References

 
• Brancewicz H.K., Dworak T.Z., 1980, AcA 30, 501 NASA ADS  
• Dugan R.S., 1933, Princeton Cont., No. 14, 1  
• Halbedel E.M., 1984, IBVS 2594  
• Kholopov P.N., 1985, The fourth edition of the General Catalogue of Variable Stars  
• Kopal Z., 1959, Close Binary Systems. Chapman & Hall, Ltd., London, p. 495  
• Kreiner J.M., 1976, AcA 26, 341 NASA ADS  
• Lucy L.B., Sweeney M.A., 1971, AJ 76, 544 NASA ADS  
• Maggini M., 1921, Men. Soc. Astron. It., n.s. 2, 293  
• Mallama A.D., 1980, ApJS 44, 241 NASA ADS  
• Pickering E.C., 1907, Harvard Circ., No. 133 (Astron. Nach. (1907) 176, 297 (4218))  
• Struve O., 1946, ApJ 104, 253 NASA ADS  
• Szczepanowska A., 1959, AcA 9, 46  
• Vyas M.L., Abhyankar K.D., 1989, A&AS 81, 67 NASA ADS  
• Whitney B.S., 1959, AJ 64, 258 NASA ADS  
• Wood B.D., Forbes J.E., 1963, AJ 68, 257 NASA ADS  
• Zinner E., 1922, Astron. Abh. 4, C3(3)