Ruth, Urs; Wagenbach, Dietmar; Steffensen, Jørgen P.; Bigler, Matthias (2003). Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period. Journal of Geophysical Research: Atmospheres, 108 (D3). 10.1029/2002JD002376