1. Draft of Three Bottom Disk Plough as Affected by Forward Speed;Bernado,1979
2. Something brand new in plows — the aeroplow;Bertelsen;Des Moines Register, Aug. 21, Sect. H,1960
3. Performance of coated floats in different soils;Canillas;J. Terramech.,1992
4. Plastic Surfaces for Tillage Tools;Cooper;ASAE Paper no. 61-649,1961
5. Characteristics of Teflon coated simple tillage tools;Fox;Trans. ASAE,1965