Aggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil Westerhof, R. ; Buurman, P. ; van Griethuysen, C. ; Ayarza, M. ; Vilela, L. ; Zech, W. Abstract Publication: Geoderma Pub Date: July 1999 DOI: 10.1016/S0016-7061(98)00133-5 Bibcode: 1999Geode..90..277W