de Sá, M. A. C., de Lima, J. M., & de Mello, C. R. (2002). Level of ultrasonic energy to study aggregate stability of a Latosol (Oxisol) under different uses. Pesquisa Agropecuaria Brasileira, 37(11), 1649–1655. https://doi.org/10.1590/S1678-3921.pab2002.v37.6513