Moros M., McManus J.F, Rasmussen T., Kuijpers A., Dokken T., Snowball I., Jansen E., Neilsen T..  2004.  Quartz content and the quartz-to-plagioclase ratio determined by X-ray diffraction: a proxy for ice rafting in the northern North Atlantic? Earth and Planetary Science Letters. 218(3-4):389-401.