1. Resistance of metals to wear by abrasion as related to hardness;Hruschow,1957
2. Experience with engines in agriculture;Gorsler;Die Technik in der Landwirtschaft,1938
3. Road laboratory for engine wear testing;Wisotsky,1958
4. Lubricating oil filter testing;Buckman,1962
5. Standard contaminant for oil filter testing;Weare,1962