4Ding Zhongli,Rutter NW,Liu Tungsheng. Pedostratigraphy of Chinese loess deposits and climatic cycles in the last 2.5Ma[ J ]. Catena, 1993,20:73-91.
5Ding Zhongli,Sun Jimin, Rutter NW et al. Changes in sand content of loess deposits along a north-south transect of Chinese loess Plateau and the implications for desert variations [ J ]. Quaternary Research, 1999,52:56-62.