Observatory and telescope: CCD photometry with various ground-based and automatic survey telescopes were used for the times of minima determination. Method of data reduction: The reduction of the CCD frames using the C-Munipack and IRAF routines. Method of minimum determination: The minima times were mostly computed with the Kwee - van Woerden method (Kwee & van Woerden, 1956), some of them with the polynomial fitting method, and the minima from the survey telescopes by the AFP method (Zasche et al. 2014).