1. ABNT—Brazilian Association of Technical Standards (1984a) Soil—grain size analysis. NBR 7181. Rio de Janeiro (in Portuguese)
2. ABNT—Brazilian Association of Technical Standards (1984b) Soil—liquid limit determination. NBR 6459. Rio de Janeiro (in Portuguese)
3. ABNT—Brazilian Association of Technical Standards (1984c) Soil—plasticity limit determination. NBR 7180. Rio de Janeiro (in Portuguese)
4. ABNT—Brazilian Association of Technical Standards (1984d) Soil grains that pass the 4.8 mm sieve—Determination of specific mass. NBR 6508. Rio de Janeiro (in Portuguese)
5. ABNT—Brazilian Association of Technical Standard (1986) Soil samples—Preparation for compaction tests and characterization tests. NBR 6457. Rio de Janeiro (in Portuguese)