EF Dra

References

1. Lu1999
   Lu, Wenxian & Rucinski, Slavek M. “Radial Velocity Studies of Close Binary Stars. I.”: 1999, The Astronomical Journal, Volume 118, pp. 515-526
   http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1999AJ....118..515L&db_key=AST&high=3f2ea4260a14099

2. Pribulla2001
   Pribulla, T., Vanko, M., Chochol, D. & Parimucha, S. “Photoelectric Photometry of the Eclipsing Contact Binaries: EF Dra GW Cep and CW Cas”: 2001, Contributions of the Astronomical Observatory Skalnate Pleso, Volume 31, pp. 26-42
   http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2001CoSka..31...26P&db_key=AST&high=3f2ea4260a26650