Nasiroglu, I., Słowikowska, A., Kanbach, G., & Haberl, F. (2012). Very fast photometric and X-ray observations of the intermediate polar V2069 Cygni (RX J2123.7+4217). Monthly Notices of the Royal Astronomical Society, 420(4), 3350-3359. doi:10.1111/j.1365-2966.2011.20256.x.