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(en) Dowson, « Men of Tribology: William Bate Hardy (1864–1934) and Arnold Sommerfeld (1868–1951) », Journal of Lubrication Technology, vol. 101, no 4, , p. 393–397 (ISSN0022-2305, DOI10.1115/1.3453381, lire en ligne)
(en) Dowson, « Men of Tribology: William Bate Hardy (1864–1934) and Arnold Sommerfeld (1868–1951) », Journal of Lubrication Technology, vol. 101, no 4, , p. 393–397 (ISSN0022-2305, DOI10.1115/1.3453381, lire en ligne)
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