ZZ Cyg

References

1. Hall1974
   Hall, Douglas S. & Cannon, Richard O. “UBV Photometry of the Eclipsing Binary ZZ Cygni”: 1974, Acta Astronomica, Volume 24, pp. 79-88
   http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1974AcA....24...79H&db_key=AST&high=3f567b0b2c16515

2. Giuricin1981
   Giuricin, G., Mardirossian, F. & Predolin, F. “Revised Photometric Elements of Seven Sd-Systems”: 1981, Astronomy & Astrophysics Supplement Series, Volume 43, pp. 251-256
   http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1981A%26AS...43..251G&db_key=AST&high=3f2ea4260a21013