R. M. Cruse CRUSE, R. M., CASSEL, D. K., & AVERETTE, F. G. (1980). EFFECT OF PARTICLE SURFACE-ROUGHNESS ON DENSIFICATION OF COARSE-TEXTURED SOIL. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 44(4), 692–697. https://doi.org/10.2136/sssaj1980.03615995004400040006x