Manser, Christopher J., Gänsicke, Boris T., Marsh, Thomas R., Veras, Dimitri, Koester, Detlev, Breedt, Elmé, Pala, Anna F., Parsons, Steven G., Southworth, John, "Doppler imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9", Monthly Notices of the Royal Astronomical Society, 2016