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2.
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ErnstMerchant1940 Proc. Conference on Friction and Surface Finish, p. 76.
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ErnstMerchant1941Surface Treatment of Metals (Proc. Am. Soc. Metals), p. 299.
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Forrester1944 Not yet published.
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Gongwer1940 Proc. Conference on Friction and Surface Finish, p. 239.
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HeidebroekPietsch1941Forsch ungauf dem Gebiete des Ingenieurwesens, vol. 12 (Mar.–Apr.).
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Schürig1940 Proc. Conference on Friction and Surface Finish, p. 141.
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Shaw1937Engineering, vol. 144, p. 757.
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Underwood1940 Proc. Conference on Friction and Surface Finish, p. 5.
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van der Horst1941The Engineer, vol. 172, p. 123; 1940 Jl. Soc. Automotive Eng., vol. 46, p. 30. (Jarrett) 1943 Mechanical Engineering, vol. 65, p. 633. (Pyles) 1943 Diesel Power, vol 12, p. 1134.
31.
Wellworthy Piston Ring Company. British Patent No. 551076; abstract in Aircraft Production 1944, vol. 6, p. 151.