1. Brixius, W.W., Wismer, R.D., 1978. The Role of Slip in Traction, ASAE Paper No. 78-1538.
2. Load and inflation pressure effects on tyres;Burt;Trans. ASAE,1982
3. Clark, J.S., Gillespie, J.R., 1979. Development of a Tractor Performance Meter. ASAE Paper No. 79-1616, St. Joseph, Michigan.
4. Erickson, L., Larsen, W., Rust, S., 1982. Four-Wheel Drive Tractor Axle and Drawbar Horsepower: Field Evaluation and Analysis. ASAE Paper No. 82-1057, St. Joseph, Michigan.
5. Freeland, R., Tompkins, F., Wilhelm, L., 1988. Portable Instrumentation to Study Performance of Lawn and Garden Ride-On Tractors. ASAE Paper No. 88-1079, St. Joseph, Michigan.