1. Categorical Data Analysis;Agresti,2002
2. Compaction and sub-soiling effects on corn and soybean yields and soil physical properties;Al-Adawi;Transactions of the ASAE,1996
3. ASAE Standards, 46 Ed. (1999a). S313.3. Soil Cone Penetrometer. ASAE, St Joseph, MI
4. ASAE Standards, 46 Ed. (1999b). EP542. Procedures for Using and Reporting Data Obtained with the Soil Cone Penetrometer. ASAE, St Joseph, MI
5. Moisture and density effect on cone index;Ayers;Transactions of the ASAE,1982