She, D.L. et al. 2010. Temporal changes of an alfalfa succession and related soil physical properties on the Loess Plateau, China. Pesquisa Agropecuaria Brasileira. 44, 2 (Nov. 2010), 189–196. DOI:https://doi.org/10.1590/S1678-3921.pab2009.v44.799.