1. Brixius, W.W., 1987. Traction prediction equations for bias ply tires. ASAE Paper No. 87-1622. ASAE St. Joseph, MI 49085.
2. Clark, J.S., Gillespie, J.R., 1979. Development of a tractor performance meter. ASAE Paper No. 79-1616. St. Joseph, Michigan.
3. 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.
4. 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.
5. Grevis-James, I.W., Devoe, D.R., Bloome, P.D., Batchelder, D.G., 1981. Microcomputer based data acquisition system for tractors. ASAE Paper No. 81-1578. St. Joseph, Michigan.