BEARD, F.R.; KOENIG, R.T.; MILLER, B.E. An Alternative Approach to Site Selection and Frequency for Global Positioning System Soil Mapping. Journal of Agricultural Systems, Technology, and Management, [S. l.], v. 14, n. 1, 2001. Disponível em: https://jastm.org/index.php/jastm/article/view/11771. Acesso em: 19 may. 2026.