Lehmann, F. J. (1910). Harmonic analysis. A.G. Comings & Son.
Lua i Stíl Chicago (17ú heag.)Lehmann, Friedrich Johann. Harmonic Analysis. Oberlin, O.: A.G. Comings & Son, 1910.
Lua MLA (8ú heag.)Lehmann, Friedrich Johann. Harmonic Analysis. A.G. Comings & Son, 1910.
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