FLEEMING JENKIN et J.-A. EWING. — Helmholtz's vowel theory and the phonograph (La théorie des voyelles de Helmholtz et le phonographe); Nature, vol. XIII, n° 347, 14 mars 1878
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A. Potier. "FLEEMING JENKIN et J.-A. EWING. — Helmholtz's vowel theory and the phonograph (La théorie des voyelles de Helmholtz et le phonographe); Nature, vol. XIII, n° 347, 14 mars 1878." Journal de Physique Théorique et Appliquée 7.1 (1878) 247-247