1. “Some Recent Research Work on the I.C. Engine”;RICARDO;The Automobile Engineer,1922
2. “The Friction of Pistons and Piston Rings”;STANTON;The Engineer,1925
3. “Friction and Aviation Engineers”;SPARROW;N.A.C.A., (U.S.A.),1927
4. “The Friction of Piston Rings”;HAWKES;Trans. N.E. Coast Inst. Engrs. and Shipbuilders,1935
5. “A Hydrodynamic Theory of Piston Ring Lubrication”;CASTLEMAN;Physics,1936