Photoelectric observations:

 taken with a 3-channel photometer and the 60-cm telescope at Mt. Suhora Observatory(Poland)
 (CN And,   V776 Cas,  UV Lyn,  BB Peg,  V592 Per,  OU Ser,  EQ Tau,  HN UMa &  HT Vir )

Photometrics S300 CCD and 50cm telescope at Astronomical Observatory, Jagiellonian University
(FU Dra)

 
 
  Results from LC modeling published by Zola at el. (2005), Acta Astronomica, vol. 55,  389.