BH Dra

References

1. Yavuz1968
   Yavuz, Ilhami “Spektroskopische und Photometrische Untersuchung des Bedeckungsveranderlichen BV 344 (BD +57 1942)”: 1968, Astronomische Abhandlungen aus der Hamburger Sternwarte, Volume 8, Number 5, pp. 1-59
   

2. Giuricin1981
   Giuricin, G. & Mardirossian, F. “Revised Photometric Elements of Five Eclipsing Binaries”: 1981, Astronomy & Astrophysics Supplement Series, Volume 45, pp. 499-505
   http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1981A%26AS...45..499G&db_key=AST&high=3f567b0b2c02539