1. Similitude studies of soil-machine systems;Freitag;Trans. ASAE,1970
2. Similitude studies of Soil-Machine Systems
3. The design of optimum multifactorial experiments;Plackett;Biometrika,1936
4. Prediction of track pull performance in a desert sand. Performance of soils under track loads;Turnage,1971
5. Similitude in Engineering;Murphy,1950